1 /* 2 * IPv6 Address [auto]configuration 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License 11 * as published by the Free Software Foundation; either version 12 * 2 of the License, or (at your option) any later version. 13 */ 14 15 /* 16 * Changes: 17 * 18 * Janos Farkas : delete timer on ifdown 19 * <chexum@bankinf.banki.hu> 20 * Andi Kleen : kill double kfree on module 21 * unload. 22 * Maciej W. Rozycki : FDDI support 23 * sekiya@USAGI : Don't send too many RS 24 * packets. 25 * yoshfuji@USAGI : Fixed interval between DAD 26 * packets. 27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of 28 * address validation timer. 29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041) 30 * support. 31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6 32 * address on a same interface. 33 * YOSHIFUJI Hideaki @USAGI : ARCnet support 34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to 35 * seq_file. 36 * YOSHIFUJI Hideaki @USAGI : improved source address 37 * selection; consider scope, 38 * status etc. 39 */ 40 41 #include <linux/errno.h> 42 #include <linux/types.h> 43 #include <linux/kernel.h> 44 #include <linux/socket.h> 45 #include <linux/sockios.h> 46 #include <linux/net.h> 47 #include <linux/in6.h> 48 #include <linux/netdevice.h> 49 #include <linux/if_addr.h> 50 #include <linux/if_arp.h> 51 #include <linux/if_arcnet.h> 52 #include <linux/if_infiniband.h> 53 #include <linux/route.h> 54 #include <linux/inetdevice.h> 55 #include <linux/init.h> 56 #include <linux/slab.h> 57 #ifdef CONFIG_SYSCTL 58 #include <linux/sysctl.h> 59 #endif 60 #include <linux/capability.h> 61 #include <linux/delay.h> 62 #include <linux/notifier.h> 63 #include <linux/string.h> 64 65 #include <net/net_namespace.h> 66 #include <net/sock.h> 67 #include <net/snmp.h> 68 69 #include <net/ipv6.h> 70 #include <net/protocol.h> 71 #include <net/ndisc.h> 72 #include <net/ip6_route.h> 73 #include <net/addrconf.h> 74 #include <net/tcp.h> 75 #include <net/ip.h> 76 #include <net/netlink.h> 77 #include <net/pkt_sched.h> 78 #include <linux/if_tunnel.h> 79 #include <linux/rtnetlink.h> 80 81 #ifdef CONFIG_IPV6_PRIVACY 82 #include <linux/random.h> 83 #endif 84 85 #include <linux/uaccess.h> 86 #include <asm/unaligned.h> 87 88 #include <linux/proc_fs.h> 89 #include <linux/seq_file.h> 90 #include <linux/export.h> 91 92 /* Set to 3 to get tracing... */ 93 #define ACONF_DEBUG 2 94 95 #if ACONF_DEBUG >= 3 96 #define ADBG(x) printk x 97 #else 98 #define ADBG(x) 99 #endif 100 101 #define INFINITY_LIFE_TIME 0xFFFFFFFF 102 103 static inline u32 cstamp_delta(unsigned long cstamp) 104 { 105 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 106 } 107 108 #define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ/50 : 1) 109 #define ADDRCONF_TIMER_FUZZ (HZ / 4) 110 #define ADDRCONF_TIMER_FUZZ_MAX (HZ) 111 112 #ifdef CONFIG_SYSCTL 113 static void addrconf_sysctl_register(struct inet6_dev *idev); 114 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 115 #else 116 static inline void addrconf_sysctl_register(struct inet6_dev *idev) 117 { 118 } 119 120 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 121 { 122 } 123 #endif 124 125 #ifdef CONFIG_IPV6_PRIVACY 126 static int __ipv6_regen_rndid(struct inet6_dev *idev); 127 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 128 static void ipv6_regen_rndid(unsigned long data); 129 #endif 130 131 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 132 static int ipv6_count_addresses(struct inet6_dev *idev); 133 134 /* 135 * Configured unicast address hash table 136 */ 137 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE]; 138 static DEFINE_SPINLOCK(addrconf_hash_lock); 139 140 static void addrconf_verify(unsigned long); 141 142 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0); 143 static DEFINE_SPINLOCK(addrconf_verify_lock); 144 145 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 146 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 147 148 static void addrconf_type_change(struct net_device *dev, 149 unsigned long event); 150 static int addrconf_ifdown(struct net_device *dev, int how); 151 152 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags); 153 static void addrconf_dad_timer(unsigned long data); 154 static void addrconf_dad_completed(struct inet6_ifaddr *ifp); 155 static void addrconf_dad_run(struct inet6_dev *idev); 156 static void addrconf_rs_timer(unsigned long data); 157 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 158 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 159 160 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 161 struct prefix_info *pinfo); 162 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 163 struct net_device *dev); 164 165 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain); 166 167 static struct ipv6_devconf ipv6_devconf __read_mostly = { 168 .forwarding = 0, 169 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 170 .mtu6 = IPV6_MIN_MTU, 171 .accept_ra = 1, 172 .accept_redirects = 1, 173 .autoconf = 1, 174 .force_mld_version = 0, 175 .dad_transmits = 1, 176 .rtr_solicits = MAX_RTR_SOLICITATIONS, 177 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 178 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 179 #ifdef CONFIG_IPV6_PRIVACY 180 .use_tempaddr = 0, 181 .temp_valid_lft = TEMP_VALID_LIFETIME, 182 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 183 .regen_max_retry = REGEN_MAX_RETRY, 184 .max_desync_factor = MAX_DESYNC_FACTOR, 185 #endif 186 .max_addresses = IPV6_MAX_ADDRESSES, 187 .accept_ra_defrtr = 1, 188 .accept_ra_pinfo = 1, 189 #ifdef CONFIG_IPV6_ROUTER_PREF 190 .accept_ra_rtr_pref = 1, 191 .rtr_probe_interval = 60 * HZ, 192 #ifdef CONFIG_IPV6_ROUTE_INFO 193 .accept_ra_rt_info_max_plen = 0, 194 #endif 195 #endif 196 .proxy_ndp = 0, 197 .accept_source_route = 0, /* we do not accept RH0 by default. */ 198 .disable_ipv6 = 0, 199 .accept_dad = 1, 200 }; 201 202 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 203 .forwarding = 0, 204 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 205 .mtu6 = IPV6_MIN_MTU, 206 .accept_ra = 1, 207 .accept_redirects = 1, 208 .autoconf = 1, 209 .dad_transmits = 1, 210 .rtr_solicits = MAX_RTR_SOLICITATIONS, 211 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 212 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 213 #ifdef CONFIG_IPV6_PRIVACY 214 .use_tempaddr = 0, 215 .temp_valid_lft = TEMP_VALID_LIFETIME, 216 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 217 .regen_max_retry = REGEN_MAX_RETRY, 218 .max_desync_factor = MAX_DESYNC_FACTOR, 219 #endif 220 .max_addresses = IPV6_MAX_ADDRESSES, 221 .accept_ra_defrtr = 1, 222 .accept_ra_pinfo = 1, 223 #ifdef CONFIG_IPV6_ROUTER_PREF 224 .accept_ra_rtr_pref = 1, 225 .rtr_probe_interval = 60 * HZ, 226 #ifdef CONFIG_IPV6_ROUTE_INFO 227 .accept_ra_rt_info_max_plen = 0, 228 #endif 229 #endif 230 .proxy_ndp = 0, 231 .accept_source_route = 0, /* we do not accept RH0 by default. */ 232 .disable_ipv6 = 0, 233 .accept_dad = 1, 234 }; 235 236 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */ 237 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 238 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 239 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT; 240 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 241 242 /* Check if a valid qdisc is available */ 243 static inline bool addrconf_qdisc_ok(const struct net_device *dev) 244 { 245 return !qdisc_tx_is_noop(dev); 246 } 247 248 /* Check if a route is valid prefix route */ 249 static inline int addrconf_is_prefix_route(const struct rt6_info *rt) 250 { 251 return (rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0; 252 } 253 254 static void addrconf_del_timer(struct inet6_ifaddr *ifp) 255 { 256 if (del_timer(&ifp->timer)) 257 __in6_ifa_put(ifp); 258 } 259 260 enum addrconf_timer_t { 261 AC_NONE, 262 AC_DAD, 263 AC_RS, 264 }; 265 266 static void addrconf_mod_timer(struct inet6_ifaddr *ifp, 267 enum addrconf_timer_t what, 268 unsigned long when) 269 { 270 if (!del_timer(&ifp->timer)) 271 in6_ifa_hold(ifp); 272 273 switch (what) { 274 case AC_DAD: 275 ifp->timer.function = addrconf_dad_timer; 276 break; 277 case AC_RS: 278 ifp->timer.function = addrconf_rs_timer; 279 break; 280 default: 281 break; 282 } 283 ifp->timer.expires = jiffies + when; 284 add_timer(&ifp->timer); 285 } 286 287 static int snmp6_alloc_dev(struct inet6_dev *idev) 288 { 289 if (snmp_mib_init((void __percpu **)idev->stats.ipv6, 290 sizeof(struct ipstats_mib), 291 __alignof__(struct ipstats_mib)) < 0) 292 goto err_ip; 293 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 294 GFP_KERNEL); 295 if (!idev->stats.icmpv6dev) 296 goto err_icmp; 297 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 298 GFP_KERNEL); 299 if (!idev->stats.icmpv6msgdev) 300 goto err_icmpmsg; 301 302 return 0; 303 304 err_icmpmsg: 305 kfree(idev->stats.icmpv6dev); 306 err_icmp: 307 snmp_mib_free((void __percpu **)idev->stats.ipv6); 308 err_ip: 309 return -ENOMEM; 310 } 311 312 static void snmp6_free_dev(struct inet6_dev *idev) 313 { 314 kfree(idev->stats.icmpv6msgdev); 315 kfree(idev->stats.icmpv6dev); 316 snmp_mib_free((void __percpu **)idev->stats.ipv6); 317 } 318 319 /* Nobody refers to this device, we may destroy it. */ 320 321 void in6_dev_finish_destroy(struct inet6_dev *idev) 322 { 323 struct net_device *dev = idev->dev; 324 325 WARN_ON(!list_empty(&idev->addr_list)); 326 WARN_ON(idev->mc_list != NULL); 327 328 #ifdef NET_REFCNT_DEBUG 329 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL"); 330 #endif 331 dev_put(dev); 332 if (!idev->dead) { 333 pr_warning("Freeing alive inet6 device %p\n", idev); 334 return; 335 } 336 snmp6_free_dev(idev); 337 kfree_rcu(idev, rcu); 338 } 339 340 EXPORT_SYMBOL(in6_dev_finish_destroy); 341 342 static struct inet6_dev * ipv6_add_dev(struct net_device *dev) 343 { 344 struct inet6_dev *ndev; 345 346 ASSERT_RTNL(); 347 348 if (dev->mtu < IPV6_MIN_MTU) 349 return NULL; 350 351 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 352 353 if (ndev == NULL) 354 return NULL; 355 356 rwlock_init(&ndev->lock); 357 ndev->dev = dev; 358 INIT_LIST_HEAD(&ndev->addr_list); 359 360 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 361 ndev->cnf.mtu6 = dev->mtu; 362 ndev->cnf.sysctl = NULL; 363 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 364 if (ndev->nd_parms == NULL) { 365 kfree(ndev); 366 return NULL; 367 } 368 if (ndev->cnf.forwarding) 369 dev_disable_lro(dev); 370 /* We refer to the device */ 371 dev_hold(dev); 372 373 if (snmp6_alloc_dev(ndev) < 0) { 374 ADBG((KERN_WARNING 375 "%s(): cannot allocate memory for statistics; dev=%s.\n", 376 __func__, dev->name)); 377 neigh_parms_release(&nd_tbl, ndev->nd_parms); 378 dev_put(dev); 379 kfree(ndev); 380 return NULL; 381 } 382 383 if (snmp6_register_dev(ndev) < 0) { 384 ADBG((KERN_WARNING 385 "%s(): cannot create /proc/net/dev_snmp6/%s\n", 386 __func__, dev->name)); 387 neigh_parms_release(&nd_tbl, ndev->nd_parms); 388 ndev->dead = 1; 389 in6_dev_finish_destroy(ndev); 390 return NULL; 391 } 392 393 /* One reference from device. We must do this before 394 * we invoke __ipv6_regen_rndid(). 395 */ 396 in6_dev_hold(ndev); 397 398 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 399 ndev->cnf.accept_dad = -1; 400 401 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 402 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 403 printk(KERN_INFO 404 "%s: Disabled Multicast RS\n", 405 dev->name); 406 ndev->cnf.rtr_solicits = 0; 407 } 408 #endif 409 410 #ifdef CONFIG_IPV6_PRIVACY 411 INIT_LIST_HEAD(&ndev->tempaddr_list); 412 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev); 413 if ((dev->flags&IFF_LOOPBACK) || 414 dev->type == ARPHRD_TUNNEL || 415 dev->type == ARPHRD_TUNNEL6 || 416 dev->type == ARPHRD_SIT || 417 dev->type == ARPHRD_NONE) { 418 ndev->cnf.use_tempaddr = -1; 419 } else { 420 in6_dev_hold(ndev); 421 ipv6_regen_rndid((unsigned long) ndev); 422 } 423 #endif 424 425 if (netif_running(dev) && addrconf_qdisc_ok(dev)) 426 ndev->if_flags |= IF_READY; 427 428 ipv6_mc_init_dev(ndev); 429 ndev->tstamp = jiffies; 430 addrconf_sysctl_register(ndev); 431 /* protected by rtnl_lock */ 432 RCU_INIT_POINTER(dev->ip6_ptr, ndev); 433 434 /* Join all-node multicast group */ 435 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 436 437 return ndev; 438 } 439 440 static struct inet6_dev * ipv6_find_idev(struct net_device *dev) 441 { 442 struct inet6_dev *idev; 443 444 ASSERT_RTNL(); 445 446 idev = __in6_dev_get(dev); 447 if (!idev) { 448 idev = ipv6_add_dev(dev); 449 if (!idev) 450 return NULL; 451 } 452 453 if (dev->flags&IFF_UP) 454 ipv6_mc_up(idev); 455 return idev; 456 } 457 458 #ifdef CONFIG_SYSCTL 459 static void dev_forward_change(struct inet6_dev *idev) 460 { 461 struct net_device *dev; 462 struct inet6_ifaddr *ifa; 463 464 if (!idev) 465 return; 466 dev = idev->dev; 467 if (idev->cnf.forwarding) 468 dev_disable_lro(dev); 469 if (dev && (dev->flags & IFF_MULTICAST)) { 470 if (idev->cnf.forwarding) 471 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 472 else 473 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 474 } 475 476 list_for_each_entry(ifa, &idev->addr_list, if_list) { 477 if (ifa->flags&IFA_F_TENTATIVE) 478 continue; 479 if (idev->cnf.forwarding) 480 addrconf_join_anycast(ifa); 481 else 482 addrconf_leave_anycast(ifa); 483 } 484 } 485 486 487 static void addrconf_forward_change(struct net *net, __s32 newf) 488 { 489 struct net_device *dev; 490 struct inet6_dev *idev; 491 492 rcu_read_lock(); 493 for_each_netdev_rcu(net, dev) { 494 idev = __in6_dev_get(dev); 495 if (idev) { 496 int changed = (!idev->cnf.forwarding) ^ (!newf); 497 idev->cnf.forwarding = newf; 498 if (changed) 499 dev_forward_change(idev); 500 } 501 } 502 rcu_read_unlock(); 503 } 504 505 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old) 506 { 507 struct net *net; 508 509 net = (struct net *)table->extra2; 510 if (p == &net->ipv6.devconf_dflt->forwarding) 511 return 0; 512 513 if (!rtnl_trylock()) { 514 /* Restore the original values before restarting */ 515 *p = old; 516 return restart_syscall(); 517 } 518 519 if (p == &net->ipv6.devconf_all->forwarding) { 520 __s32 newf = net->ipv6.devconf_all->forwarding; 521 net->ipv6.devconf_dflt->forwarding = newf; 522 addrconf_forward_change(net, newf); 523 } else if ((!*p) ^ (!old)) 524 dev_forward_change((struct inet6_dev *)table->extra1); 525 rtnl_unlock(); 526 527 if (*p) 528 rt6_purge_dflt_routers(net); 529 return 1; 530 } 531 #endif 532 533 /* Nobody refers to this ifaddr, destroy it */ 534 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 535 { 536 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 537 538 #ifdef NET_REFCNT_DEBUG 539 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n"); 540 #endif 541 542 in6_dev_put(ifp->idev); 543 544 if (del_timer(&ifp->timer)) 545 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp); 546 547 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 548 pr_warning("Freeing alive inet6 address %p\n", ifp); 549 return; 550 } 551 dst_release(&ifp->rt->dst); 552 553 kfree_rcu(ifp, rcu); 554 } 555 556 static void 557 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 558 { 559 struct list_head *p; 560 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 561 562 /* 563 * Each device address list is sorted in order of scope - 564 * global before linklocal. 565 */ 566 list_for_each(p, &idev->addr_list) { 567 struct inet6_ifaddr *ifa 568 = list_entry(p, struct inet6_ifaddr, if_list); 569 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 570 break; 571 } 572 573 list_add_tail(&ifp->if_list, p); 574 } 575 576 static u32 ipv6_addr_hash(const struct in6_addr *addr) 577 { 578 /* 579 * We perform the hash function over the last 64 bits of the address 580 * This will include the IEEE address token on links that support it. 581 */ 582 return jhash_2words((__force u32)addr->s6_addr32[2], 583 (__force u32)addr->s6_addr32[3], 0) 584 & (IN6_ADDR_HSIZE - 1); 585 } 586 587 /* On success it returns ifp with increased reference count */ 588 589 static struct inet6_ifaddr * 590 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen, 591 int scope, u32 flags) 592 { 593 struct inet6_ifaddr *ifa = NULL; 594 struct rt6_info *rt; 595 unsigned int hash; 596 int err = 0; 597 int addr_type = ipv6_addr_type(addr); 598 599 if (addr_type == IPV6_ADDR_ANY || 600 addr_type & IPV6_ADDR_MULTICAST || 601 (!(idev->dev->flags & IFF_LOOPBACK) && 602 addr_type & IPV6_ADDR_LOOPBACK)) 603 return ERR_PTR(-EADDRNOTAVAIL); 604 605 rcu_read_lock_bh(); 606 if (idev->dead) { 607 err = -ENODEV; /*XXX*/ 608 goto out2; 609 } 610 611 if (idev->cnf.disable_ipv6) { 612 err = -EACCES; 613 goto out2; 614 } 615 616 spin_lock(&addrconf_hash_lock); 617 618 /* Ignore adding duplicate addresses on an interface */ 619 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { 620 ADBG(("ipv6_add_addr: already assigned\n")); 621 err = -EEXIST; 622 goto out; 623 } 624 625 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 626 627 if (ifa == NULL) { 628 ADBG(("ipv6_add_addr: malloc failed\n")); 629 err = -ENOBUFS; 630 goto out; 631 } 632 633 rt = addrconf_dst_alloc(idev, addr, false); 634 if (IS_ERR(rt)) { 635 err = PTR_ERR(rt); 636 goto out; 637 } 638 639 ifa->addr = *addr; 640 641 spin_lock_init(&ifa->lock); 642 spin_lock_init(&ifa->state_lock); 643 init_timer(&ifa->timer); 644 INIT_HLIST_NODE(&ifa->addr_lst); 645 ifa->timer.data = (unsigned long) ifa; 646 ifa->scope = scope; 647 ifa->prefix_len = pfxlen; 648 ifa->flags = flags | IFA_F_TENTATIVE; 649 ifa->cstamp = ifa->tstamp = jiffies; 650 651 ifa->rt = rt; 652 653 ifa->idev = idev; 654 in6_dev_hold(idev); 655 /* For caller */ 656 in6_ifa_hold(ifa); 657 658 /* Add to big hash table */ 659 hash = ipv6_addr_hash(addr); 660 661 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 662 spin_unlock(&addrconf_hash_lock); 663 664 write_lock(&idev->lock); 665 /* Add to inet6_dev unicast addr list. */ 666 ipv6_link_dev_addr(idev, ifa); 667 668 #ifdef CONFIG_IPV6_PRIVACY 669 if (ifa->flags&IFA_F_TEMPORARY) { 670 list_add(&ifa->tmp_list, &idev->tempaddr_list); 671 in6_ifa_hold(ifa); 672 } 673 #endif 674 675 in6_ifa_hold(ifa); 676 write_unlock(&idev->lock); 677 out2: 678 rcu_read_unlock_bh(); 679 680 if (likely(err == 0)) 681 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa); 682 else { 683 kfree(ifa); 684 ifa = ERR_PTR(err); 685 } 686 687 return ifa; 688 out: 689 spin_unlock(&addrconf_hash_lock); 690 goto out2; 691 } 692 693 /* This function wants to get referenced ifp and releases it before return */ 694 695 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 696 { 697 struct inet6_ifaddr *ifa, *ifn; 698 struct inet6_dev *idev = ifp->idev; 699 int state; 700 int deleted = 0, onlink = 0; 701 unsigned long expires = jiffies; 702 703 spin_lock_bh(&ifp->state_lock); 704 state = ifp->state; 705 ifp->state = INET6_IFADDR_STATE_DEAD; 706 spin_unlock_bh(&ifp->state_lock); 707 708 if (state == INET6_IFADDR_STATE_DEAD) 709 goto out; 710 711 spin_lock_bh(&addrconf_hash_lock); 712 hlist_del_init_rcu(&ifp->addr_lst); 713 spin_unlock_bh(&addrconf_hash_lock); 714 715 write_lock_bh(&idev->lock); 716 #ifdef CONFIG_IPV6_PRIVACY 717 if (ifp->flags&IFA_F_TEMPORARY) { 718 list_del(&ifp->tmp_list); 719 if (ifp->ifpub) { 720 in6_ifa_put(ifp->ifpub); 721 ifp->ifpub = NULL; 722 } 723 __in6_ifa_put(ifp); 724 } 725 #endif 726 727 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) { 728 if (ifa == ifp) { 729 list_del_init(&ifp->if_list); 730 __in6_ifa_put(ifp); 731 732 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0) 733 break; 734 deleted = 1; 735 continue; 736 } else if (ifp->flags & IFA_F_PERMANENT) { 737 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr, 738 ifp->prefix_len)) { 739 if (ifa->flags & IFA_F_PERMANENT) { 740 onlink = 1; 741 if (deleted) 742 break; 743 } else { 744 unsigned long lifetime; 745 746 if (!onlink) 747 onlink = -1; 748 749 spin_lock(&ifa->lock); 750 751 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 752 /* 753 * Note: Because this address is 754 * not permanent, lifetime < 755 * LONG_MAX / HZ here. 756 */ 757 if (time_before(expires, 758 ifa->tstamp + lifetime * HZ)) 759 expires = ifa->tstamp + lifetime * HZ; 760 spin_unlock(&ifa->lock); 761 } 762 } 763 } 764 } 765 write_unlock_bh(&idev->lock); 766 767 addrconf_del_timer(ifp); 768 769 ipv6_ifa_notify(RTM_DELADDR, ifp); 770 771 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp); 772 773 /* 774 * Purge or update corresponding prefix 775 * 776 * 1) we don't purge prefix here if address was not permanent. 777 * prefix is managed by its own lifetime. 778 * 2) if there're no addresses, delete prefix. 779 * 3) if there're still other permanent address(es), 780 * corresponding prefix is still permanent. 781 * 4) otherwise, update prefix lifetime to the 782 * longest valid lifetime among the corresponding 783 * addresses on the device. 784 * Note: subsequent RA will update lifetime. 785 * 786 * --yoshfuji 787 */ 788 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) { 789 struct in6_addr prefix; 790 struct rt6_info *rt; 791 struct net *net = dev_net(ifp->idev->dev); 792 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len); 793 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1); 794 795 if (rt && addrconf_is_prefix_route(rt)) { 796 if (onlink == 0) { 797 ip6_del_rt(rt); 798 rt = NULL; 799 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) { 800 rt->dst.expires = expires; 801 rt->rt6i_flags |= RTF_EXPIRES; 802 } 803 } 804 dst_release(&rt->dst); 805 } 806 807 /* clean up prefsrc entries */ 808 rt6_remove_prefsrc(ifp); 809 out: 810 in6_ifa_put(ifp); 811 } 812 813 #ifdef CONFIG_IPV6_PRIVACY 814 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 815 { 816 struct inet6_dev *idev = ifp->idev; 817 struct in6_addr addr, *tmpaddr; 818 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age; 819 unsigned long regen_advance; 820 int tmp_plen; 821 int ret = 0; 822 int max_addresses; 823 u32 addr_flags; 824 unsigned long now = jiffies; 825 826 write_lock(&idev->lock); 827 if (ift) { 828 spin_lock_bh(&ift->lock); 829 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 830 spin_unlock_bh(&ift->lock); 831 tmpaddr = &addr; 832 } else { 833 tmpaddr = NULL; 834 } 835 retry: 836 in6_dev_hold(idev); 837 if (idev->cnf.use_tempaddr <= 0) { 838 write_unlock(&idev->lock); 839 printk(KERN_INFO 840 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n"); 841 in6_dev_put(idev); 842 ret = -1; 843 goto out; 844 } 845 spin_lock_bh(&ifp->lock); 846 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 847 idev->cnf.use_tempaddr = -1; /*XXX*/ 848 spin_unlock_bh(&ifp->lock); 849 write_unlock(&idev->lock); 850 printk(KERN_WARNING 851 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n"); 852 in6_dev_put(idev); 853 ret = -1; 854 goto out; 855 } 856 in6_ifa_hold(ifp); 857 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 858 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) { 859 spin_unlock_bh(&ifp->lock); 860 write_unlock(&idev->lock); 861 printk(KERN_WARNING 862 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n"); 863 in6_ifa_put(ifp); 864 in6_dev_put(idev); 865 ret = -1; 866 goto out; 867 } 868 memcpy(&addr.s6_addr[8], idev->rndid, 8); 869 age = (now - ifp->tstamp) / HZ; 870 tmp_valid_lft = min_t(__u32, 871 ifp->valid_lft, 872 idev->cnf.temp_valid_lft + age); 873 tmp_prefered_lft = min_t(__u32, 874 ifp->prefered_lft, 875 idev->cnf.temp_prefered_lft + age - 876 idev->cnf.max_desync_factor); 877 tmp_plen = ifp->prefix_len; 878 max_addresses = idev->cnf.max_addresses; 879 tmp_tstamp = ifp->tstamp; 880 spin_unlock_bh(&ifp->lock); 881 882 regen_advance = idev->cnf.regen_max_retry * 883 idev->cnf.dad_transmits * 884 idev->nd_parms->retrans_time / HZ; 885 write_unlock(&idev->lock); 886 887 /* A temporary address is created only if this calculated Preferred 888 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 889 * an implementation must not create a temporary address with a zero 890 * Preferred Lifetime. 891 */ 892 if (tmp_prefered_lft <= regen_advance) { 893 in6_ifa_put(ifp); 894 in6_dev_put(idev); 895 ret = -1; 896 goto out; 897 } 898 899 addr_flags = IFA_F_TEMPORARY; 900 /* set in addrconf_prefix_rcv() */ 901 if (ifp->flags & IFA_F_OPTIMISTIC) 902 addr_flags |= IFA_F_OPTIMISTIC; 903 904 ift = !max_addresses || 905 ipv6_count_addresses(idev) < max_addresses ? 906 ipv6_add_addr(idev, &addr, tmp_plen, 907 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, 908 addr_flags) : NULL; 909 if (!ift || IS_ERR(ift)) { 910 in6_ifa_put(ifp); 911 in6_dev_put(idev); 912 printk(KERN_INFO 913 "ipv6_create_tempaddr(): retry temporary address regeneration.\n"); 914 tmpaddr = &addr; 915 write_lock(&idev->lock); 916 goto retry; 917 } 918 919 spin_lock_bh(&ift->lock); 920 ift->ifpub = ifp; 921 ift->valid_lft = tmp_valid_lft; 922 ift->prefered_lft = tmp_prefered_lft; 923 ift->cstamp = now; 924 ift->tstamp = tmp_tstamp; 925 spin_unlock_bh(&ift->lock); 926 927 addrconf_dad_start(ift, 0); 928 in6_ifa_put(ift); 929 in6_dev_put(idev); 930 out: 931 return ret; 932 } 933 #endif 934 935 /* 936 * Choose an appropriate source address (RFC3484) 937 */ 938 enum { 939 IPV6_SADDR_RULE_INIT = 0, 940 IPV6_SADDR_RULE_LOCAL, 941 IPV6_SADDR_RULE_SCOPE, 942 IPV6_SADDR_RULE_PREFERRED, 943 #ifdef CONFIG_IPV6_MIP6 944 IPV6_SADDR_RULE_HOA, 945 #endif 946 IPV6_SADDR_RULE_OIF, 947 IPV6_SADDR_RULE_LABEL, 948 #ifdef CONFIG_IPV6_PRIVACY 949 IPV6_SADDR_RULE_PRIVACY, 950 #endif 951 IPV6_SADDR_RULE_ORCHID, 952 IPV6_SADDR_RULE_PREFIX, 953 IPV6_SADDR_RULE_MAX 954 }; 955 956 struct ipv6_saddr_score { 957 int rule; 958 int addr_type; 959 struct inet6_ifaddr *ifa; 960 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 961 int scopedist; 962 int matchlen; 963 }; 964 965 struct ipv6_saddr_dst { 966 const struct in6_addr *addr; 967 int ifindex; 968 int scope; 969 int label; 970 unsigned int prefs; 971 }; 972 973 static inline int ipv6_saddr_preferred(int type) 974 { 975 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 976 return 1; 977 return 0; 978 } 979 980 static int ipv6_get_saddr_eval(struct net *net, 981 struct ipv6_saddr_score *score, 982 struct ipv6_saddr_dst *dst, 983 int i) 984 { 985 int ret; 986 987 if (i <= score->rule) { 988 switch (i) { 989 case IPV6_SADDR_RULE_SCOPE: 990 ret = score->scopedist; 991 break; 992 case IPV6_SADDR_RULE_PREFIX: 993 ret = score->matchlen; 994 break; 995 default: 996 ret = !!test_bit(i, score->scorebits); 997 } 998 goto out; 999 } 1000 1001 switch (i) { 1002 case IPV6_SADDR_RULE_INIT: 1003 /* Rule 0: remember if hiscore is not ready yet */ 1004 ret = !!score->ifa; 1005 break; 1006 case IPV6_SADDR_RULE_LOCAL: 1007 /* Rule 1: Prefer same address */ 1008 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1009 break; 1010 case IPV6_SADDR_RULE_SCOPE: 1011 /* Rule 2: Prefer appropriate scope 1012 * 1013 * ret 1014 * ^ 1015 * -1 | d 15 1016 * ---+--+-+---> scope 1017 * | 1018 * | d is scope of the destination. 1019 * B-d | \ 1020 * | \ <- smaller scope is better if 1021 * B-15 | \ if scope is enough for destinaion. 1022 * | ret = B - scope (-1 <= scope >= d <= 15). 1023 * d-C-1 | / 1024 * |/ <- greater is better 1025 * -C / if scope is not enough for destination. 1026 * /| ret = scope - C (-1 <= d < scope <= 15). 1027 * 1028 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1029 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1030 * Assume B = 0 and we get C > 29. 1031 */ 1032 ret = __ipv6_addr_src_scope(score->addr_type); 1033 if (ret >= dst->scope) 1034 ret = -ret; 1035 else 1036 ret -= 128; /* 30 is enough */ 1037 score->scopedist = ret; 1038 break; 1039 case IPV6_SADDR_RULE_PREFERRED: 1040 /* Rule 3: Avoid deprecated and optimistic addresses */ 1041 ret = ipv6_saddr_preferred(score->addr_type) || 1042 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)); 1043 break; 1044 #ifdef CONFIG_IPV6_MIP6 1045 case IPV6_SADDR_RULE_HOA: 1046 { 1047 /* Rule 4: Prefer home address */ 1048 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1049 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1050 break; 1051 } 1052 #endif 1053 case IPV6_SADDR_RULE_OIF: 1054 /* Rule 5: Prefer outgoing interface */ 1055 ret = (!dst->ifindex || 1056 dst->ifindex == score->ifa->idev->dev->ifindex); 1057 break; 1058 case IPV6_SADDR_RULE_LABEL: 1059 /* Rule 6: Prefer matching label */ 1060 ret = ipv6_addr_label(net, 1061 &score->ifa->addr, score->addr_type, 1062 score->ifa->idev->dev->ifindex) == dst->label; 1063 break; 1064 #ifdef CONFIG_IPV6_PRIVACY 1065 case IPV6_SADDR_RULE_PRIVACY: 1066 { 1067 /* Rule 7: Prefer public address 1068 * Note: prefer temporary address if use_tempaddr >= 2 1069 */ 1070 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1071 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1072 score->ifa->idev->cnf.use_tempaddr >= 2; 1073 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1074 break; 1075 } 1076 #endif 1077 case IPV6_SADDR_RULE_ORCHID: 1078 /* Rule 8-: Prefer ORCHID vs ORCHID or 1079 * non-ORCHID vs non-ORCHID 1080 */ 1081 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1082 ipv6_addr_orchid(dst->addr)); 1083 break; 1084 case IPV6_SADDR_RULE_PREFIX: 1085 /* Rule 8: Use longest matching prefix */ 1086 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr, 1087 dst->addr); 1088 break; 1089 default: 1090 ret = 0; 1091 } 1092 1093 if (ret) 1094 __set_bit(i, score->scorebits); 1095 score->rule = i; 1096 out: 1097 return ret; 1098 } 1099 1100 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev, 1101 const struct in6_addr *daddr, unsigned int prefs, 1102 struct in6_addr *saddr) 1103 { 1104 struct ipv6_saddr_score scores[2], 1105 *score = &scores[0], *hiscore = &scores[1]; 1106 struct ipv6_saddr_dst dst; 1107 struct net_device *dev; 1108 int dst_type; 1109 1110 dst_type = __ipv6_addr_type(daddr); 1111 dst.addr = daddr; 1112 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1113 dst.scope = __ipv6_addr_src_scope(dst_type); 1114 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1115 dst.prefs = prefs; 1116 1117 hiscore->rule = -1; 1118 hiscore->ifa = NULL; 1119 1120 rcu_read_lock(); 1121 1122 for_each_netdev_rcu(net, dev) { 1123 struct inet6_dev *idev; 1124 1125 /* Candidate Source Address (section 4) 1126 * - multicast and link-local destination address, 1127 * the set of candidate source address MUST only 1128 * include addresses assigned to interfaces 1129 * belonging to the same link as the outgoing 1130 * interface. 1131 * (- For site-local destination addresses, the 1132 * set of candidate source addresses MUST only 1133 * include addresses assigned to interfaces 1134 * belonging to the same site as the outgoing 1135 * interface.) 1136 */ 1137 if (((dst_type & IPV6_ADDR_MULTICAST) || 1138 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) && 1139 dst.ifindex && dev->ifindex != dst.ifindex) 1140 continue; 1141 1142 idev = __in6_dev_get(dev); 1143 if (!idev) 1144 continue; 1145 1146 read_lock_bh(&idev->lock); 1147 list_for_each_entry(score->ifa, &idev->addr_list, if_list) { 1148 int i; 1149 1150 /* 1151 * - Tentative Address (RFC2462 section 5.4) 1152 * - A tentative address is not considered 1153 * "assigned to an interface" in the traditional 1154 * sense, unless it is also flagged as optimistic. 1155 * - Candidate Source Address (section 4) 1156 * - In any case, anycast addresses, multicast 1157 * addresses, and the unspecified address MUST 1158 * NOT be included in a candidate set. 1159 */ 1160 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1161 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1162 continue; 1163 1164 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1165 1166 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1167 score->addr_type & IPV6_ADDR_MULTICAST)) { 1168 LIMIT_NETDEBUG(KERN_DEBUG 1169 "ADDRCONF: unspecified / multicast address " 1170 "assigned as unicast address on %s", 1171 dev->name); 1172 continue; 1173 } 1174 1175 score->rule = -1; 1176 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1177 1178 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1179 int minihiscore, miniscore; 1180 1181 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i); 1182 miniscore = ipv6_get_saddr_eval(net, score, &dst, i); 1183 1184 if (minihiscore > miniscore) { 1185 if (i == IPV6_SADDR_RULE_SCOPE && 1186 score->scopedist > 0) { 1187 /* 1188 * special case: 1189 * each remaining entry 1190 * has too small (not enough) 1191 * scope, because ifa entries 1192 * are sorted by their scope 1193 * values. 1194 */ 1195 goto try_nextdev; 1196 } 1197 break; 1198 } else if (minihiscore < miniscore) { 1199 if (hiscore->ifa) 1200 in6_ifa_put(hiscore->ifa); 1201 1202 in6_ifa_hold(score->ifa); 1203 1204 swap(hiscore, score); 1205 1206 /* restore our iterator */ 1207 score->ifa = hiscore->ifa; 1208 1209 break; 1210 } 1211 } 1212 } 1213 try_nextdev: 1214 read_unlock_bh(&idev->lock); 1215 } 1216 rcu_read_unlock(); 1217 1218 if (!hiscore->ifa) 1219 return -EADDRNOTAVAIL; 1220 1221 *saddr = hiscore->ifa->addr; 1222 in6_ifa_put(hiscore->ifa); 1223 return 0; 1224 } 1225 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1226 1227 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1228 unsigned char banned_flags) 1229 { 1230 struct inet6_dev *idev; 1231 int err = -EADDRNOTAVAIL; 1232 1233 rcu_read_lock(); 1234 idev = __in6_dev_get(dev); 1235 if (idev) { 1236 struct inet6_ifaddr *ifp; 1237 1238 read_lock_bh(&idev->lock); 1239 list_for_each_entry(ifp, &idev->addr_list, if_list) { 1240 if (ifp->scope == IFA_LINK && 1241 !(ifp->flags & banned_flags)) { 1242 *addr = ifp->addr; 1243 err = 0; 1244 break; 1245 } 1246 } 1247 read_unlock_bh(&idev->lock); 1248 } 1249 rcu_read_unlock(); 1250 return err; 1251 } 1252 1253 static int ipv6_count_addresses(struct inet6_dev *idev) 1254 { 1255 int cnt = 0; 1256 struct inet6_ifaddr *ifp; 1257 1258 read_lock_bh(&idev->lock); 1259 list_for_each_entry(ifp, &idev->addr_list, if_list) 1260 cnt++; 1261 read_unlock_bh(&idev->lock); 1262 return cnt; 1263 } 1264 1265 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1266 struct net_device *dev, int strict) 1267 { 1268 struct inet6_ifaddr *ifp; 1269 struct hlist_node *node; 1270 unsigned int hash = ipv6_addr_hash(addr); 1271 1272 rcu_read_lock_bh(); 1273 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) { 1274 if (!net_eq(dev_net(ifp->idev->dev), net)) 1275 continue; 1276 if (ipv6_addr_equal(&ifp->addr, addr) && 1277 !(ifp->flags&IFA_F_TENTATIVE) && 1278 (dev == NULL || ifp->idev->dev == dev || 1279 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1280 rcu_read_unlock_bh(); 1281 return 1; 1282 } 1283 } 1284 1285 rcu_read_unlock_bh(); 1286 return 0; 1287 } 1288 EXPORT_SYMBOL(ipv6_chk_addr); 1289 1290 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1291 struct net_device *dev) 1292 { 1293 unsigned int hash = ipv6_addr_hash(addr); 1294 struct inet6_ifaddr *ifp; 1295 struct hlist_node *node; 1296 1297 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) { 1298 if (!net_eq(dev_net(ifp->idev->dev), net)) 1299 continue; 1300 if (ipv6_addr_equal(&ifp->addr, addr)) { 1301 if (dev == NULL || ifp->idev->dev == dev) 1302 return true; 1303 } 1304 } 1305 return false; 1306 } 1307 1308 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1309 { 1310 struct inet6_dev *idev; 1311 struct inet6_ifaddr *ifa; 1312 int onlink; 1313 1314 onlink = 0; 1315 rcu_read_lock(); 1316 idev = __in6_dev_get(dev); 1317 if (idev) { 1318 read_lock_bh(&idev->lock); 1319 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1320 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1321 ifa->prefix_len); 1322 if (onlink) 1323 break; 1324 } 1325 read_unlock_bh(&idev->lock); 1326 } 1327 rcu_read_unlock(); 1328 return onlink; 1329 } 1330 1331 EXPORT_SYMBOL(ipv6_chk_prefix); 1332 1333 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1334 struct net_device *dev, int strict) 1335 { 1336 struct inet6_ifaddr *ifp, *result = NULL; 1337 unsigned int hash = ipv6_addr_hash(addr); 1338 struct hlist_node *node; 1339 1340 rcu_read_lock_bh(); 1341 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) { 1342 if (!net_eq(dev_net(ifp->idev->dev), net)) 1343 continue; 1344 if (ipv6_addr_equal(&ifp->addr, addr)) { 1345 if (dev == NULL || ifp->idev->dev == dev || 1346 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1347 result = ifp; 1348 in6_ifa_hold(ifp); 1349 break; 1350 } 1351 } 1352 } 1353 rcu_read_unlock_bh(); 1354 1355 return result; 1356 } 1357 1358 /* Gets referenced address, destroys ifaddr */ 1359 1360 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1361 { 1362 if (ifp->flags&IFA_F_PERMANENT) { 1363 spin_lock_bh(&ifp->lock); 1364 addrconf_del_timer(ifp); 1365 ifp->flags |= IFA_F_TENTATIVE; 1366 if (dad_failed) 1367 ifp->flags |= IFA_F_DADFAILED; 1368 spin_unlock_bh(&ifp->lock); 1369 if (dad_failed) 1370 ipv6_ifa_notify(0, ifp); 1371 in6_ifa_put(ifp); 1372 #ifdef CONFIG_IPV6_PRIVACY 1373 } else if (ifp->flags&IFA_F_TEMPORARY) { 1374 struct inet6_ifaddr *ifpub; 1375 spin_lock_bh(&ifp->lock); 1376 ifpub = ifp->ifpub; 1377 if (ifpub) { 1378 in6_ifa_hold(ifpub); 1379 spin_unlock_bh(&ifp->lock); 1380 ipv6_create_tempaddr(ifpub, ifp); 1381 in6_ifa_put(ifpub); 1382 } else { 1383 spin_unlock_bh(&ifp->lock); 1384 } 1385 ipv6_del_addr(ifp); 1386 #endif 1387 } else 1388 ipv6_del_addr(ifp); 1389 } 1390 1391 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 1392 { 1393 int err = -ENOENT; 1394 1395 spin_lock(&ifp->state_lock); 1396 if (ifp->state == INET6_IFADDR_STATE_DAD) { 1397 ifp->state = INET6_IFADDR_STATE_POSTDAD; 1398 err = 0; 1399 } 1400 spin_unlock(&ifp->state_lock); 1401 1402 return err; 1403 } 1404 1405 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1406 { 1407 struct inet6_dev *idev = ifp->idev; 1408 1409 if (addrconf_dad_end(ifp)) { 1410 in6_ifa_put(ifp); 1411 return; 1412 } 1413 1414 if (net_ratelimit()) 1415 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n", 1416 ifp->idev->dev->name, &ifp->addr); 1417 1418 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) { 1419 struct in6_addr addr; 1420 1421 addr.s6_addr32[0] = htonl(0xfe800000); 1422 addr.s6_addr32[1] = 0; 1423 1424 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 1425 ipv6_addr_equal(&ifp->addr, &addr)) { 1426 /* DAD failed for link-local based on MAC address */ 1427 idev->cnf.disable_ipv6 = 1; 1428 1429 printk(KERN_INFO "%s: IPv6 being disabled!\n", 1430 ifp->idev->dev->name); 1431 } 1432 } 1433 1434 addrconf_dad_stop(ifp, 1); 1435 } 1436 1437 /* Join to solicited addr multicast group. */ 1438 1439 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 1440 { 1441 struct in6_addr maddr; 1442 1443 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1444 return; 1445 1446 addrconf_addr_solict_mult(addr, &maddr); 1447 ipv6_dev_mc_inc(dev, &maddr); 1448 } 1449 1450 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 1451 { 1452 struct in6_addr maddr; 1453 1454 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1455 return; 1456 1457 addrconf_addr_solict_mult(addr, &maddr); 1458 __ipv6_dev_mc_dec(idev, &maddr); 1459 } 1460 1461 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1462 { 1463 struct in6_addr addr; 1464 if (ifp->prefix_len == 127) /* RFC 6164 */ 1465 return; 1466 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1467 if (ipv6_addr_any(&addr)) 1468 return; 1469 ipv6_dev_ac_inc(ifp->idev->dev, &addr); 1470 } 1471 1472 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1473 { 1474 struct in6_addr addr; 1475 if (ifp->prefix_len == 127) /* RFC 6164 */ 1476 return; 1477 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1478 if (ipv6_addr_any(&addr)) 1479 return; 1480 __ipv6_dev_ac_dec(ifp->idev, &addr); 1481 } 1482 1483 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 1484 { 1485 if (dev->addr_len != ETH_ALEN) 1486 return -1; 1487 memcpy(eui, dev->dev_addr, 3); 1488 memcpy(eui + 5, dev->dev_addr + 3, 3); 1489 1490 /* 1491 * The zSeries OSA network cards can be shared among various 1492 * OS instances, but the OSA cards have only one MAC address. 1493 * This leads to duplicate address conflicts in conjunction 1494 * with IPv6 if more than one instance uses the same card. 1495 * 1496 * The driver for these cards can deliver a unique 16-bit 1497 * identifier for each instance sharing the same card. It is 1498 * placed instead of 0xFFFE in the interface identifier. The 1499 * "u" bit of the interface identifier is not inverted in this 1500 * case. Hence the resulting interface identifier has local 1501 * scope according to RFC2373. 1502 */ 1503 if (dev->dev_id) { 1504 eui[3] = (dev->dev_id >> 8) & 0xFF; 1505 eui[4] = dev->dev_id & 0xFF; 1506 } else { 1507 eui[3] = 0xFF; 1508 eui[4] = 0xFE; 1509 eui[0] ^= 2; 1510 } 1511 return 0; 1512 } 1513 1514 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1515 { 1516 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1517 if (dev->addr_len != ARCNET_ALEN) 1518 return -1; 1519 memset(eui, 0, 7); 1520 eui[7] = *(u8*)dev->dev_addr; 1521 return 0; 1522 } 1523 1524 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1525 { 1526 if (dev->addr_len != INFINIBAND_ALEN) 1527 return -1; 1528 memcpy(eui, dev->dev_addr + 12, 8); 1529 eui[0] |= 2; 1530 return 0; 1531 } 1532 1533 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 1534 { 1535 if (addr == 0) 1536 return -1; 1537 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 1538 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 1539 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 1540 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 1541 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 1542 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 1543 eui[1] = 0; 1544 eui[2] = 0x5E; 1545 eui[3] = 0xFE; 1546 memcpy(eui + 4, &addr, 4); 1547 return 0; 1548 } 1549 1550 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 1551 { 1552 if (dev->priv_flags & IFF_ISATAP) 1553 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1554 return -1; 1555 } 1556 1557 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 1558 { 1559 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1560 } 1561 1562 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1563 { 1564 switch (dev->type) { 1565 case ARPHRD_ETHER: 1566 case ARPHRD_FDDI: 1567 case ARPHRD_IEEE802_TR: 1568 return addrconf_ifid_eui48(eui, dev); 1569 case ARPHRD_ARCNET: 1570 return addrconf_ifid_arcnet(eui, dev); 1571 case ARPHRD_INFINIBAND: 1572 return addrconf_ifid_infiniband(eui, dev); 1573 case ARPHRD_SIT: 1574 return addrconf_ifid_sit(eui, dev); 1575 case ARPHRD_IPGRE: 1576 return addrconf_ifid_gre(eui, dev); 1577 } 1578 return -1; 1579 } 1580 1581 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 1582 { 1583 int err = -1; 1584 struct inet6_ifaddr *ifp; 1585 1586 read_lock_bh(&idev->lock); 1587 list_for_each_entry(ifp, &idev->addr_list, if_list) { 1588 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1589 memcpy(eui, ifp->addr.s6_addr+8, 8); 1590 err = 0; 1591 break; 1592 } 1593 } 1594 read_unlock_bh(&idev->lock); 1595 return err; 1596 } 1597 1598 #ifdef CONFIG_IPV6_PRIVACY 1599 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 1600 static int __ipv6_regen_rndid(struct inet6_dev *idev) 1601 { 1602 regen: 1603 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 1604 idev->rndid[0] &= ~0x02; 1605 1606 /* 1607 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 1608 * check if generated address is not inappropriate 1609 * 1610 * - Reserved subnet anycast (RFC 2526) 1611 * 11111101 11....11 1xxxxxxx 1612 * - ISATAP (RFC4214) 6.1 1613 * 00-00-5E-FE-xx-xx-xx-xx 1614 * - value 0 1615 * - XXX: already assigned to an address on the device 1616 */ 1617 if (idev->rndid[0] == 0xfd && 1618 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 1619 (idev->rndid[7]&0x80)) 1620 goto regen; 1621 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 1622 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 1623 goto regen; 1624 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 1625 goto regen; 1626 } 1627 1628 return 0; 1629 } 1630 1631 static void ipv6_regen_rndid(unsigned long data) 1632 { 1633 struct inet6_dev *idev = (struct inet6_dev *) data; 1634 unsigned long expires; 1635 1636 rcu_read_lock_bh(); 1637 write_lock_bh(&idev->lock); 1638 1639 if (idev->dead) 1640 goto out; 1641 1642 if (__ipv6_regen_rndid(idev) < 0) 1643 goto out; 1644 1645 expires = jiffies + 1646 idev->cnf.temp_prefered_lft * HZ - 1647 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - 1648 idev->cnf.max_desync_factor * HZ; 1649 if (time_before(expires, jiffies)) { 1650 printk(KERN_WARNING 1651 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n", 1652 idev->dev->name); 1653 goto out; 1654 } 1655 1656 if (!mod_timer(&idev->regen_timer, expires)) 1657 in6_dev_hold(idev); 1658 1659 out: 1660 write_unlock_bh(&idev->lock); 1661 rcu_read_unlock_bh(); 1662 in6_dev_put(idev); 1663 } 1664 1665 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) { 1666 int ret = 0; 1667 1668 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 1669 ret = __ipv6_regen_rndid(idev); 1670 return ret; 1671 } 1672 #endif 1673 1674 /* 1675 * Add prefix route. 1676 */ 1677 1678 static void 1679 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 1680 unsigned long expires, u32 flags) 1681 { 1682 struct fib6_config cfg = { 1683 .fc_table = RT6_TABLE_PREFIX, 1684 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1685 .fc_ifindex = dev->ifindex, 1686 .fc_expires = expires, 1687 .fc_dst_len = plen, 1688 .fc_flags = RTF_UP | flags, 1689 .fc_nlinfo.nl_net = dev_net(dev), 1690 .fc_protocol = RTPROT_KERNEL, 1691 }; 1692 1693 cfg.fc_dst = *pfx; 1694 1695 /* Prevent useless cloning on PtP SIT. 1696 This thing is done here expecting that the whole 1697 class of non-broadcast devices need not cloning. 1698 */ 1699 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1700 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 1701 cfg.fc_flags |= RTF_NONEXTHOP; 1702 #endif 1703 1704 ip6_route_add(&cfg); 1705 } 1706 1707 1708 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 1709 int plen, 1710 const struct net_device *dev, 1711 u32 flags, u32 noflags) 1712 { 1713 struct fib6_node *fn; 1714 struct rt6_info *rt = NULL; 1715 struct fib6_table *table; 1716 1717 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX); 1718 if (table == NULL) 1719 return NULL; 1720 1721 write_lock_bh(&table->tb6_lock); 1722 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0); 1723 if (!fn) 1724 goto out; 1725 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { 1726 if (rt->dst.dev->ifindex != dev->ifindex) 1727 continue; 1728 if ((rt->rt6i_flags & flags) != flags) 1729 continue; 1730 if ((noflags != 0) && ((rt->rt6i_flags & flags) != 0)) 1731 continue; 1732 dst_hold(&rt->dst); 1733 break; 1734 } 1735 out: 1736 write_unlock_bh(&table->tb6_lock); 1737 return rt; 1738 } 1739 1740 1741 /* Create "default" multicast route to the interface */ 1742 1743 static void addrconf_add_mroute(struct net_device *dev) 1744 { 1745 struct fib6_config cfg = { 1746 .fc_table = RT6_TABLE_LOCAL, 1747 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1748 .fc_ifindex = dev->ifindex, 1749 .fc_dst_len = 8, 1750 .fc_flags = RTF_UP, 1751 .fc_nlinfo.nl_net = dev_net(dev), 1752 }; 1753 1754 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 1755 1756 ip6_route_add(&cfg); 1757 } 1758 1759 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 1760 static void sit_route_add(struct net_device *dev) 1761 { 1762 struct fib6_config cfg = { 1763 .fc_table = RT6_TABLE_MAIN, 1764 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1765 .fc_ifindex = dev->ifindex, 1766 .fc_dst_len = 96, 1767 .fc_flags = RTF_UP | RTF_NONEXTHOP, 1768 .fc_nlinfo.nl_net = dev_net(dev), 1769 }; 1770 1771 /* prefix length - 96 bits "::d.d.d.d" */ 1772 ip6_route_add(&cfg); 1773 } 1774 #endif 1775 1776 static void addrconf_add_lroute(struct net_device *dev) 1777 { 1778 struct in6_addr addr; 1779 1780 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 1781 addrconf_prefix_route(&addr, 64, dev, 0, 0); 1782 } 1783 1784 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 1785 { 1786 struct inet6_dev *idev; 1787 1788 ASSERT_RTNL(); 1789 1790 idev = ipv6_find_idev(dev); 1791 if (!idev) 1792 return ERR_PTR(-ENOBUFS); 1793 1794 if (idev->cnf.disable_ipv6) 1795 return ERR_PTR(-EACCES); 1796 1797 /* Add default multicast route */ 1798 if (!(dev->flags & IFF_LOOPBACK)) 1799 addrconf_add_mroute(dev); 1800 1801 /* Add link local route */ 1802 addrconf_add_lroute(dev); 1803 return idev; 1804 } 1805 1806 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 1807 { 1808 struct prefix_info *pinfo; 1809 __u32 valid_lft; 1810 __u32 prefered_lft; 1811 int addr_type; 1812 struct inet6_dev *in6_dev; 1813 struct net *net = dev_net(dev); 1814 1815 pinfo = (struct prefix_info *) opt; 1816 1817 if (len < sizeof(struct prefix_info)) { 1818 ADBG(("addrconf: prefix option too short\n")); 1819 return; 1820 } 1821 1822 /* 1823 * Validation checks ([ADDRCONF], page 19) 1824 */ 1825 1826 addr_type = ipv6_addr_type(&pinfo->prefix); 1827 1828 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 1829 return; 1830 1831 valid_lft = ntohl(pinfo->valid); 1832 prefered_lft = ntohl(pinfo->prefered); 1833 1834 if (prefered_lft > valid_lft) { 1835 if (net_ratelimit()) 1836 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n"); 1837 return; 1838 } 1839 1840 in6_dev = in6_dev_get(dev); 1841 1842 if (in6_dev == NULL) { 1843 if (net_ratelimit()) 1844 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name); 1845 return; 1846 } 1847 1848 /* 1849 * Two things going on here: 1850 * 1) Add routes for on-link prefixes 1851 * 2) Configure prefixes with the auto flag set 1852 */ 1853 1854 if (pinfo->onlink) { 1855 struct rt6_info *rt; 1856 unsigned long rt_expires; 1857 1858 /* Avoid arithmetic overflow. Really, we could 1859 * save rt_expires in seconds, likely valid_lft, 1860 * but it would require division in fib gc, that it 1861 * not good. 1862 */ 1863 if (HZ > USER_HZ) 1864 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 1865 else 1866 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 1867 1868 if (addrconf_finite_timeout(rt_expires)) 1869 rt_expires *= HZ; 1870 1871 rt = addrconf_get_prefix_route(&pinfo->prefix, 1872 pinfo->prefix_len, 1873 dev, 1874 RTF_ADDRCONF | RTF_PREFIX_RT, 1875 RTF_GATEWAY | RTF_DEFAULT); 1876 1877 if (rt) { 1878 /* Autoconf prefix route */ 1879 if (valid_lft == 0) { 1880 ip6_del_rt(rt); 1881 rt = NULL; 1882 } else if (addrconf_finite_timeout(rt_expires)) { 1883 /* not infinity */ 1884 rt->dst.expires = jiffies + rt_expires; 1885 rt->rt6i_flags |= RTF_EXPIRES; 1886 } else { 1887 rt->rt6i_flags &= ~RTF_EXPIRES; 1888 rt->dst.expires = 0; 1889 } 1890 } else if (valid_lft) { 1891 clock_t expires = 0; 1892 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 1893 if (addrconf_finite_timeout(rt_expires)) { 1894 /* not infinity */ 1895 flags |= RTF_EXPIRES; 1896 expires = jiffies_to_clock_t(rt_expires); 1897 } 1898 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 1899 dev, expires, flags); 1900 } 1901 if (rt) 1902 dst_release(&rt->dst); 1903 } 1904 1905 /* Try to figure out our local address for this prefix */ 1906 1907 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 1908 struct inet6_ifaddr * ifp; 1909 struct in6_addr addr; 1910 int create = 0, update_lft = 0; 1911 1912 if (pinfo->prefix_len == 64) { 1913 memcpy(&addr, &pinfo->prefix, 8); 1914 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 1915 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 1916 in6_dev_put(in6_dev); 1917 return; 1918 } 1919 goto ok; 1920 } 1921 if (net_ratelimit()) 1922 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n", 1923 pinfo->prefix_len); 1924 in6_dev_put(in6_dev); 1925 return; 1926 1927 ok: 1928 1929 ifp = ipv6_get_ifaddr(net, &addr, dev, 1); 1930 1931 if (ifp == NULL && valid_lft) { 1932 int max_addresses = in6_dev->cnf.max_addresses; 1933 u32 addr_flags = 0; 1934 1935 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1936 if (in6_dev->cnf.optimistic_dad && 1937 !net->ipv6.devconf_all->forwarding && sllao) 1938 addr_flags = IFA_F_OPTIMISTIC; 1939 #endif 1940 1941 /* Do not allow to create too much of autoconfigured 1942 * addresses; this would be too easy way to crash kernel. 1943 */ 1944 if (!max_addresses || 1945 ipv6_count_addresses(in6_dev) < max_addresses) 1946 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len, 1947 addr_type&IPV6_ADDR_SCOPE_MASK, 1948 addr_flags); 1949 1950 if (!ifp || IS_ERR(ifp)) { 1951 in6_dev_put(in6_dev); 1952 return; 1953 } 1954 1955 update_lft = create = 1; 1956 ifp->cstamp = jiffies; 1957 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT); 1958 } 1959 1960 if (ifp) { 1961 int flags; 1962 unsigned long now; 1963 #ifdef CONFIG_IPV6_PRIVACY 1964 struct inet6_ifaddr *ift; 1965 #endif 1966 u32 stored_lft; 1967 1968 /* update lifetime (RFC2462 5.5.3 e) */ 1969 spin_lock(&ifp->lock); 1970 now = jiffies; 1971 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 1972 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 1973 else 1974 stored_lft = 0; 1975 if (!update_lft && stored_lft) { 1976 if (valid_lft > MIN_VALID_LIFETIME || 1977 valid_lft > stored_lft) 1978 update_lft = 1; 1979 else if (stored_lft <= MIN_VALID_LIFETIME) { 1980 /* valid_lft <= stored_lft is always true */ 1981 /* 1982 * RFC 4862 Section 5.5.3e: 1983 * "Note that the preferred lifetime of 1984 * the corresponding address is always 1985 * reset to the Preferred Lifetime in 1986 * the received Prefix Information 1987 * option, regardless of whether the 1988 * valid lifetime is also reset or 1989 * ignored." 1990 * 1991 * So if the preferred lifetime in 1992 * this advertisement is different 1993 * than what we have stored, but the 1994 * valid lifetime is invalid, just 1995 * reset prefered_lft. 1996 * 1997 * We must set the valid lifetime 1998 * to the stored lifetime since we'll 1999 * be updating the timestamp below, 2000 * else we'll set it back to the 2001 * minimum. 2002 */ 2003 if (prefered_lft != ifp->prefered_lft) { 2004 valid_lft = stored_lft; 2005 update_lft = 1; 2006 } 2007 } else { 2008 valid_lft = MIN_VALID_LIFETIME; 2009 if (valid_lft < prefered_lft) 2010 prefered_lft = valid_lft; 2011 update_lft = 1; 2012 } 2013 } 2014 2015 if (update_lft) { 2016 ifp->valid_lft = valid_lft; 2017 ifp->prefered_lft = prefered_lft; 2018 ifp->tstamp = now; 2019 flags = ifp->flags; 2020 ifp->flags &= ~IFA_F_DEPRECATED; 2021 spin_unlock(&ifp->lock); 2022 2023 if (!(flags&IFA_F_TENTATIVE)) 2024 ipv6_ifa_notify(0, ifp); 2025 } else 2026 spin_unlock(&ifp->lock); 2027 2028 #ifdef CONFIG_IPV6_PRIVACY 2029 read_lock_bh(&in6_dev->lock); 2030 /* update all temporary addresses in the list */ 2031 list_for_each_entry(ift, &in6_dev->tempaddr_list, 2032 tmp_list) { 2033 int age, max_valid, max_prefered; 2034 2035 if (ifp != ift->ifpub) 2036 continue; 2037 2038 /* 2039 * RFC 4941 section 3.3: 2040 * If a received option will extend the lifetime 2041 * of a public address, the lifetimes of 2042 * temporary addresses should be extended, 2043 * subject to the overall constraint that no 2044 * temporary addresses should ever remain 2045 * "valid" or "preferred" for a time longer than 2046 * (TEMP_VALID_LIFETIME) or 2047 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), 2048 * respectively. 2049 */ 2050 age = (now - ift->cstamp) / HZ; 2051 max_valid = in6_dev->cnf.temp_valid_lft - age; 2052 if (max_valid < 0) 2053 max_valid = 0; 2054 2055 max_prefered = in6_dev->cnf.temp_prefered_lft - 2056 in6_dev->cnf.max_desync_factor - 2057 age; 2058 if (max_prefered < 0) 2059 max_prefered = 0; 2060 2061 if (valid_lft > max_valid) 2062 valid_lft = max_valid; 2063 2064 if (prefered_lft > max_prefered) 2065 prefered_lft = max_prefered; 2066 2067 spin_lock(&ift->lock); 2068 flags = ift->flags; 2069 ift->valid_lft = valid_lft; 2070 ift->prefered_lft = prefered_lft; 2071 ift->tstamp = now; 2072 if (prefered_lft > 0) 2073 ift->flags &= ~IFA_F_DEPRECATED; 2074 2075 spin_unlock(&ift->lock); 2076 if (!(flags&IFA_F_TENTATIVE)) 2077 ipv6_ifa_notify(0, ift); 2078 } 2079 2080 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) { 2081 /* 2082 * When a new public address is created as 2083 * described in [ADDRCONF], also create a new 2084 * temporary address. Also create a temporary 2085 * address if it's enabled but no temporary 2086 * address currently exists. 2087 */ 2088 read_unlock_bh(&in6_dev->lock); 2089 ipv6_create_tempaddr(ifp, NULL); 2090 } else { 2091 read_unlock_bh(&in6_dev->lock); 2092 } 2093 #endif 2094 in6_ifa_put(ifp); 2095 addrconf_verify(0); 2096 } 2097 } 2098 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2099 in6_dev_put(in6_dev); 2100 } 2101 2102 /* 2103 * Set destination address. 2104 * Special case for SIT interfaces where we create a new "virtual" 2105 * device. 2106 */ 2107 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2108 { 2109 struct in6_ifreq ireq; 2110 struct net_device *dev; 2111 int err = -EINVAL; 2112 2113 rtnl_lock(); 2114 2115 err = -EFAULT; 2116 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2117 goto err_exit; 2118 2119 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2120 2121 err = -ENODEV; 2122 if (dev == NULL) 2123 goto err_exit; 2124 2125 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2126 if (dev->type == ARPHRD_SIT) { 2127 const struct net_device_ops *ops = dev->netdev_ops; 2128 struct ifreq ifr; 2129 struct ip_tunnel_parm p; 2130 2131 err = -EADDRNOTAVAIL; 2132 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2133 goto err_exit; 2134 2135 memset(&p, 0, sizeof(p)); 2136 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2137 p.iph.saddr = 0; 2138 p.iph.version = 4; 2139 p.iph.ihl = 5; 2140 p.iph.protocol = IPPROTO_IPV6; 2141 p.iph.ttl = 64; 2142 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2143 2144 if (ops->ndo_do_ioctl) { 2145 mm_segment_t oldfs = get_fs(); 2146 2147 set_fs(KERNEL_DS); 2148 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2149 set_fs(oldfs); 2150 } else 2151 err = -EOPNOTSUPP; 2152 2153 if (err == 0) { 2154 err = -ENOBUFS; 2155 dev = __dev_get_by_name(net, p.name); 2156 if (!dev) 2157 goto err_exit; 2158 err = dev_open(dev); 2159 } 2160 } 2161 #endif 2162 2163 err_exit: 2164 rtnl_unlock(); 2165 return err; 2166 } 2167 2168 /* 2169 * Manual configuration of address on an interface 2170 */ 2171 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx, 2172 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft, 2173 __u32 valid_lft) 2174 { 2175 struct inet6_ifaddr *ifp; 2176 struct inet6_dev *idev; 2177 struct net_device *dev; 2178 int scope; 2179 u32 flags; 2180 clock_t expires; 2181 unsigned long timeout; 2182 2183 ASSERT_RTNL(); 2184 2185 if (plen > 128) 2186 return -EINVAL; 2187 2188 /* check the lifetime */ 2189 if (!valid_lft || prefered_lft > valid_lft) 2190 return -EINVAL; 2191 2192 dev = __dev_get_by_index(net, ifindex); 2193 if (!dev) 2194 return -ENODEV; 2195 2196 idev = addrconf_add_dev(dev); 2197 if (IS_ERR(idev)) 2198 return PTR_ERR(idev); 2199 2200 scope = ipv6_addr_scope(pfx); 2201 2202 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2203 if (addrconf_finite_timeout(timeout)) { 2204 expires = jiffies_to_clock_t(timeout * HZ); 2205 valid_lft = timeout; 2206 flags = RTF_EXPIRES; 2207 } else { 2208 expires = 0; 2209 flags = 0; 2210 ifa_flags |= IFA_F_PERMANENT; 2211 } 2212 2213 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2214 if (addrconf_finite_timeout(timeout)) { 2215 if (timeout == 0) 2216 ifa_flags |= IFA_F_DEPRECATED; 2217 prefered_lft = timeout; 2218 } 2219 2220 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags); 2221 2222 if (!IS_ERR(ifp)) { 2223 spin_lock_bh(&ifp->lock); 2224 ifp->valid_lft = valid_lft; 2225 ifp->prefered_lft = prefered_lft; 2226 ifp->tstamp = jiffies; 2227 spin_unlock_bh(&ifp->lock); 2228 2229 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2230 expires, flags); 2231 /* 2232 * Note that section 3.1 of RFC 4429 indicates 2233 * that the Optimistic flag should not be set for 2234 * manually configured addresses 2235 */ 2236 addrconf_dad_start(ifp, 0); 2237 in6_ifa_put(ifp); 2238 addrconf_verify(0); 2239 return 0; 2240 } 2241 2242 return PTR_ERR(ifp); 2243 } 2244 2245 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx, 2246 unsigned int plen) 2247 { 2248 struct inet6_ifaddr *ifp; 2249 struct inet6_dev *idev; 2250 struct net_device *dev; 2251 2252 if (plen > 128) 2253 return -EINVAL; 2254 2255 dev = __dev_get_by_index(net, ifindex); 2256 if (!dev) 2257 return -ENODEV; 2258 2259 if ((idev = __in6_dev_get(dev)) == NULL) 2260 return -ENXIO; 2261 2262 read_lock_bh(&idev->lock); 2263 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2264 if (ifp->prefix_len == plen && 2265 ipv6_addr_equal(pfx, &ifp->addr)) { 2266 in6_ifa_hold(ifp); 2267 read_unlock_bh(&idev->lock); 2268 2269 ipv6_del_addr(ifp); 2270 2271 /* If the last address is deleted administratively, 2272 disable IPv6 on this interface. 2273 */ 2274 if (list_empty(&idev->addr_list)) 2275 addrconf_ifdown(idev->dev, 1); 2276 return 0; 2277 } 2278 } 2279 read_unlock_bh(&idev->lock); 2280 return -EADDRNOTAVAIL; 2281 } 2282 2283 2284 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2285 { 2286 struct in6_ifreq ireq; 2287 int err; 2288 2289 if (!capable(CAP_NET_ADMIN)) 2290 return -EPERM; 2291 2292 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2293 return -EFAULT; 2294 2295 rtnl_lock(); 2296 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2297 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2298 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2299 rtnl_unlock(); 2300 return err; 2301 } 2302 2303 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2304 { 2305 struct in6_ifreq ireq; 2306 int err; 2307 2308 if (!capable(CAP_NET_ADMIN)) 2309 return -EPERM; 2310 2311 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2312 return -EFAULT; 2313 2314 rtnl_lock(); 2315 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2316 ireq.ifr6_prefixlen); 2317 rtnl_unlock(); 2318 return err; 2319 } 2320 2321 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2322 int plen, int scope) 2323 { 2324 struct inet6_ifaddr *ifp; 2325 2326 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT); 2327 if (!IS_ERR(ifp)) { 2328 spin_lock_bh(&ifp->lock); 2329 ifp->flags &= ~IFA_F_TENTATIVE; 2330 spin_unlock_bh(&ifp->lock); 2331 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2332 in6_ifa_put(ifp); 2333 } 2334 } 2335 2336 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2337 static void sit_add_v4_addrs(struct inet6_dev *idev) 2338 { 2339 struct in6_addr addr; 2340 struct net_device *dev; 2341 struct net *net = dev_net(idev->dev); 2342 int scope; 2343 2344 ASSERT_RTNL(); 2345 2346 memset(&addr, 0, sizeof(struct in6_addr)); 2347 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2348 2349 if (idev->dev->flags&IFF_POINTOPOINT) { 2350 addr.s6_addr32[0] = htonl(0xfe800000); 2351 scope = IFA_LINK; 2352 } else { 2353 scope = IPV6_ADDR_COMPATv4; 2354 } 2355 2356 if (addr.s6_addr32[3]) { 2357 add_addr(idev, &addr, 128, scope); 2358 return; 2359 } 2360 2361 for_each_netdev(net, dev) { 2362 struct in_device * in_dev = __in_dev_get_rtnl(dev); 2363 if (in_dev && (dev->flags & IFF_UP)) { 2364 struct in_ifaddr * ifa; 2365 2366 int flag = scope; 2367 2368 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2369 int plen; 2370 2371 addr.s6_addr32[3] = ifa->ifa_local; 2372 2373 if (ifa->ifa_scope == RT_SCOPE_LINK) 2374 continue; 2375 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2376 if (idev->dev->flags&IFF_POINTOPOINT) 2377 continue; 2378 flag |= IFA_HOST; 2379 } 2380 if (idev->dev->flags&IFF_POINTOPOINT) 2381 plen = 64; 2382 else 2383 plen = 96; 2384 2385 add_addr(idev, &addr, plen, flag); 2386 } 2387 } 2388 } 2389 } 2390 #endif 2391 2392 static void init_loopback(struct net_device *dev) 2393 { 2394 struct inet6_dev *idev; 2395 2396 /* ::1 */ 2397 2398 ASSERT_RTNL(); 2399 2400 if ((idev = ipv6_find_idev(dev)) == NULL) { 2401 printk(KERN_DEBUG "init loopback: add_dev failed\n"); 2402 return; 2403 } 2404 2405 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 2406 } 2407 2408 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr) 2409 { 2410 struct inet6_ifaddr * ifp; 2411 u32 addr_flags = IFA_F_PERMANENT; 2412 2413 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2414 if (idev->cnf.optimistic_dad && 2415 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 2416 addr_flags |= IFA_F_OPTIMISTIC; 2417 #endif 2418 2419 2420 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags); 2421 if (!IS_ERR(ifp)) { 2422 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2423 addrconf_dad_start(ifp, 0); 2424 in6_ifa_put(ifp); 2425 } 2426 } 2427 2428 static void addrconf_dev_config(struct net_device *dev) 2429 { 2430 struct in6_addr addr; 2431 struct inet6_dev * idev; 2432 2433 ASSERT_RTNL(); 2434 2435 if ((dev->type != ARPHRD_ETHER) && 2436 (dev->type != ARPHRD_FDDI) && 2437 (dev->type != ARPHRD_IEEE802_TR) && 2438 (dev->type != ARPHRD_ARCNET) && 2439 (dev->type != ARPHRD_INFINIBAND)) { 2440 /* Alas, we support only Ethernet autoconfiguration. */ 2441 return; 2442 } 2443 2444 idev = addrconf_add_dev(dev); 2445 if (IS_ERR(idev)) 2446 return; 2447 2448 memset(&addr, 0, sizeof(struct in6_addr)); 2449 addr.s6_addr32[0] = htonl(0xFE800000); 2450 2451 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) 2452 addrconf_add_linklocal(idev, &addr); 2453 } 2454 2455 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2456 static void addrconf_sit_config(struct net_device *dev) 2457 { 2458 struct inet6_dev *idev; 2459 2460 ASSERT_RTNL(); 2461 2462 /* 2463 * Configure the tunnel with one of our IPv4 2464 * addresses... we should configure all of 2465 * our v4 addrs in the tunnel 2466 */ 2467 2468 if ((idev = ipv6_find_idev(dev)) == NULL) { 2469 printk(KERN_DEBUG "init sit: add_dev failed\n"); 2470 return; 2471 } 2472 2473 if (dev->priv_flags & IFF_ISATAP) { 2474 struct in6_addr addr; 2475 2476 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2477 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2478 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2479 addrconf_add_linklocal(idev, &addr); 2480 return; 2481 } 2482 2483 sit_add_v4_addrs(idev); 2484 2485 if (dev->flags&IFF_POINTOPOINT) { 2486 addrconf_add_mroute(dev); 2487 addrconf_add_lroute(dev); 2488 } else 2489 sit_route_add(dev); 2490 } 2491 #endif 2492 2493 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE) 2494 static void addrconf_gre_config(struct net_device *dev) 2495 { 2496 struct inet6_dev *idev; 2497 struct in6_addr addr; 2498 2499 pr_info("ipv6: addrconf_gre_config(%s)\n", dev->name); 2500 2501 ASSERT_RTNL(); 2502 2503 if ((idev = ipv6_find_idev(dev)) == NULL) { 2504 printk(KERN_DEBUG "init gre: add_dev failed\n"); 2505 return; 2506 } 2507 2508 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2509 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2510 2511 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2512 addrconf_add_linklocal(idev, &addr); 2513 } 2514 #endif 2515 2516 static inline int 2517 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev) 2518 { 2519 struct in6_addr lladdr; 2520 2521 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) { 2522 addrconf_add_linklocal(idev, &lladdr); 2523 return 0; 2524 } 2525 return -1; 2526 } 2527 2528 static void ip6_tnl_add_linklocal(struct inet6_dev *idev) 2529 { 2530 struct net_device *link_dev; 2531 struct net *net = dev_net(idev->dev); 2532 2533 /* first try to inherit the link-local address from the link device */ 2534 if (idev->dev->iflink && 2535 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) { 2536 if (!ipv6_inherit_linklocal(idev, link_dev)) 2537 return; 2538 } 2539 /* then try to inherit it from any device */ 2540 for_each_netdev(net, link_dev) { 2541 if (!ipv6_inherit_linklocal(idev, link_dev)) 2542 return; 2543 } 2544 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n"); 2545 } 2546 2547 /* 2548 * Autoconfigure tunnel with a link-local address so routing protocols, 2549 * DHCPv6, MLD etc. can be run over the virtual link 2550 */ 2551 2552 static void addrconf_ip6_tnl_config(struct net_device *dev) 2553 { 2554 struct inet6_dev *idev; 2555 2556 ASSERT_RTNL(); 2557 2558 idev = addrconf_add_dev(dev); 2559 if (IS_ERR(idev)) { 2560 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n"); 2561 return; 2562 } 2563 ip6_tnl_add_linklocal(idev); 2564 } 2565 2566 static int addrconf_notify(struct notifier_block *this, unsigned long event, 2567 void * data) 2568 { 2569 struct net_device *dev = (struct net_device *) data; 2570 struct inet6_dev *idev = __in6_dev_get(dev); 2571 int run_pending = 0; 2572 int err; 2573 2574 switch (event) { 2575 case NETDEV_REGISTER: 2576 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2577 idev = ipv6_add_dev(dev); 2578 if (!idev) 2579 return notifier_from_errno(-ENOMEM); 2580 } 2581 break; 2582 2583 case NETDEV_UP: 2584 case NETDEV_CHANGE: 2585 if (dev->flags & IFF_SLAVE) 2586 break; 2587 2588 if (event == NETDEV_UP) { 2589 if (!addrconf_qdisc_ok(dev)) { 2590 /* device is not ready yet. */ 2591 printk(KERN_INFO 2592 "ADDRCONF(NETDEV_UP): %s: " 2593 "link is not ready\n", 2594 dev->name); 2595 break; 2596 } 2597 2598 if (!idev && dev->mtu >= IPV6_MIN_MTU) 2599 idev = ipv6_add_dev(dev); 2600 2601 if (idev) { 2602 idev->if_flags |= IF_READY; 2603 run_pending = 1; 2604 } 2605 } else { 2606 if (!addrconf_qdisc_ok(dev)) { 2607 /* device is still not ready. */ 2608 break; 2609 } 2610 2611 if (idev) { 2612 if (idev->if_flags & IF_READY) 2613 /* device is already configured. */ 2614 break; 2615 idev->if_flags |= IF_READY; 2616 } 2617 2618 printk(KERN_INFO 2619 "ADDRCONF(NETDEV_CHANGE): %s: " 2620 "link becomes ready\n", 2621 dev->name); 2622 2623 run_pending = 1; 2624 } 2625 2626 switch (dev->type) { 2627 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE) 2628 case ARPHRD_SIT: 2629 addrconf_sit_config(dev); 2630 break; 2631 #endif 2632 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE) 2633 case ARPHRD_IPGRE: 2634 addrconf_gre_config(dev); 2635 break; 2636 #endif 2637 case ARPHRD_TUNNEL6: 2638 addrconf_ip6_tnl_config(dev); 2639 break; 2640 case ARPHRD_LOOPBACK: 2641 init_loopback(dev); 2642 break; 2643 2644 default: 2645 addrconf_dev_config(dev); 2646 break; 2647 } 2648 2649 if (idev) { 2650 if (run_pending) 2651 addrconf_dad_run(idev); 2652 2653 /* 2654 * If the MTU changed during the interface down, 2655 * when the interface up, the changed MTU must be 2656 * reflected in the idev as well as routers. 2657 */ 2658 if (idev->cnf.mtu6 != dev->mtu && 2659 dev->mtu >= IPV6_MIN_MTU) { 2660 rt6_mtu_change(dev, dev->mtu); 2661 idev->cnf.mtu6 = dev->mtu; 2662 } 2663 idev->tstamp = jiffies; 2664 inet6_ifinfo_notify(RTM_NEWLINK, idev); 2665 2666 /* 2667 * If the changed mtu during down is lower than 2668 * IPV6_MIN_MTU stop IPv6 on this interface. 2669 */ 2670 if (dev->mtu < IPV6_MIN_MTU) 2671 addrconf_ifdown(dev, 1); 2672 } 2673 break; 2674 2675 case NETDEV_CHANGEMTU: 2676 if (idev && dev->mtu >= IPV6_MIN_MTU) { 2677 rt6_mtu_change(dev, dev->mtu); 2678 idev->cnf.mtu6 = dev->mtu; 2679 break; 2680 } 2681 2682 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2683 idev = ipv6_add_dev(dev); 2684 if (idev) 2685 break; 2686 } 2687 2688 /* 2689 * MTU falled under IPV6_MIN_MTU. 2690 * Stop IPv6 on this interface. 2691 */ 2692 2693 case NETDEV_DOWN: 2694 case NETDEV_UNREGISTER: 2695 /* 2696 * Remove all addresses from this interface. 2697 */ 2698 addrconf_ifdown(dev, event != NETDEV_DOWN); 2699 break; 2700 2701 case NETDEV_CHANGENAME: 2702 if (idev) { 2703 snmp6_unregister_dev(idev); 2704 addrconf_sysctl_unregister(idev); 2705 addrconf_sysctl_register(idev); 2706 err = snmp6_register_dev(idev); 2707 if (err) 2708 return notifier_from_errno(err); 2709 } 2710 break; 2711 2712 case NETDEV_PRE_TYPE_CHANGE: 2713 case NETDEV_POST_TYPE_CHANGE: 2714 addrconf_type_change(dev, event); 2715 break; 2716 } 2717 2718 return NOTIFY_OK; 2719 } 2720 2721 /* 2722 * addrconf module should be notified of a device going up 2723 */ 2724 static struct notifier_block ipv6_dev_notf = { 2725 .notifier_call = addrconf_notify, 2726 }; 2727 2728 static void addrconf_type_change(struct net_device *dev, unsigned long event) 2729 { 2730 struct inet6_dev *idev; 2731 ASSERT_RTNL(); 2732 2733 idev = __in6_dev_get(dev); 2734 2735 if (event == NETDEV_POST_TYPE_CHANGE) 2736 ipv6_mc_remap(idev); 2737 else if (event == NETDEV_PRE_TYPE_CHANGE) 2738 ipv6_mc_unmap(idev); 2739 } 2740 2741 static int addrconf_ifdown(struct net_device *dev, int how) 2742 { 2743 struct net *net = dev_net(dev); 2744 struct inet6_dev *idev; 2745 struct inet6_ifaddr *ifa; 2746 int state, i; 2747 2748 ASSERT_RTNL(); 2749 2750 rt6_ifdown(net, dev); 2751 neigh_ifdown(&nd_tbl, dev); 2752 2753 idev = __in6_dev_get(dev); 2754 if (idev == NULL) 2755 return -ENODEV; 2756 2757 /* 2758 * Step 1: remove reference to ipv6 device from parent device. 2759 * Do not dev_put! 2760 */ 2761 if (how) { 2762 idev->dead = 1; 2763 2764 /* protected by rtnl_lock */ 2765 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 2766 2767 /* Step 1.5: remove snmp6 entry */ 2768 snmp6_unregister_dev(idev); 2769 2770 } 2771 2772 /* Step 2: clear hash table */ 2773 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 2774 struct hlist_head *h = &inet6_addr_lst[i]; 2775 struct hlist_node *n; 2776 2777 spin_lock_bh(&addrconf_hash_lock); 2778 restart: 2779 hlist_for_each_entry_rcu(ifa, n, h, addr_lst) { 2780 if (ifa->idev == idev) { 2781 hlist_del_init_rcu(&ifa->addr_lst); 2782 addrconf_del_timer(ifa); 2783 goto restart; 2784 } 2785 } 2786 spin_unlock_bh(&addrconf_hash_lock); 2787 } 2788 2789 write_lock_bh(&idev->lock); 2790 2791 /* Step 2: clear flags for stateless addrconf */ 2792 if (!how) 2793 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 2794 2795 #ifdef CONFIG_IPV6_PRIVACY 2796 if (how && del_timer(&idev->regen_timer)) 2797 in6_dev_put(idev); 2798 2799 /* Step 3: clear tempaddr list */ 2800 while (!list_empty(&idev->tempaddr_list)) { 2801 ifa = list_first_entry(&idev->tempaddr_list, 2802 struct inet6_ifaddr, tmp_list); 2803 list_del(&ifa->tmp_list); 2804 write_unlock_bh(&idev->lock); 2805 spin_lock_bh(&ifa->lock); 2806 2807 if (ifa->ifpub) { 2808 in6_ifa_put(ifa->ifpub); 2809 ifa->ifpub = NULL; 2810 } 2811 spin_unlock_bh(&ifa->lock); 2812 in6_ifa_put(ifa); 2813 write_lock_bh(&idev->lock); 2814 } 2815 #endif 2816 2817 while (!list_empty(&idev->addr_list)) { 2818 ifa = list_first_entry(&idev->addr_list, 2819 struct inet6_ifaddr, if_list); 2820 addrconf_del_timer(ifa); 2821 2822 list_del(&ifa->if_list); 2823 2824 write_unlock_bh(&idev->lock); 2825 2826 spin_lock_bh(&ifa->state_lock); 2827 state = ifa->state; 2828 ifa->state = INET6_IFADDR_STATE_DEAD; 2829 spin_unlock_bh(&ifa->state_lock); 2830 2831 if (state != INET6_IFADDR_STATE_DEAD) { 2832 __ipv6_ifa_notify(RTM_DELADDR, ifa); 2833 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa); 2834 } 2835 in6_ifa_put(ifa); 2836 2837 write_lock_bh(&idev->lock); 2838 } 2839 2840 write_unlock_bh(&idev->lock); 2841 2842 /* Step 5: Discard multicast list */ 2843 if (how) 2844 ipv6_mc_destroy_dev(idev); 2845 else 2846 ipv6_mc_down(idev); 2847 2848 idev->tstamp = jiffies; 2849 2850 /* Last: Shot the device (if unregistered) */ 2851 if (how) { 2852 addrconf_sysctl_unregister(idev); 2853 neigh_parms_release(&nd_tbl, idev->nd_parms); 2854 neigh_ifdown(&nd_tbl, dev); 2855 in6_dev_put(idev); 2856 } 2857 return 0; 2858 } 2859 2860 static void addrconf_rs_timer(unsigned long data) 2861 { 2862 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2863 struct inet6_dev *idev = ifp->idev; 2864 2865 read_lock(&idev->lock); 2866 if (idev->dead || !(idev->if_flags & IF_READY)) 2867 goto out; 2868 2869 if (idev->cnf.forwarding) 2870 goto out; 2871 2872 /* Announcement received after solicitation was sent */ 2873 if (idev->if_flags & IF_RA_RCVD) 2874 goto out; 2875 2876 spin_lock(&ifp->lock); 2877 if (ifp->probes++ < idev->cnf.rtr_solicits) { 2878 /* The wait after the last probe can be shorter */ 2879 addrconf_mod_timer(ifp, AC_RS, 2880 (ifp->probes == idev->cnf.rtr_solicits) ? 2881 idev->cnf.rtr_solicit_delay : 2882 idev->cnf.rtr_solicit_interval); 2883 spin_unlock(&ifp->lock); 2884 2885 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 2886 } else { 2887 spin_unlock(&ifp->lock); 2888 /* 2889 * Note: we do not support deprecated "all on-link" 2890 * assumption any longer. 2891 */ 2892 printk(KERN_DEBUG "%s: no IPv6 routers present\n", 2893 idev->dev->name); 2894 } 2895 2896 out: 2897 read_unlock(&idev->lock); 2898 in6_ifa_put(ifp); 2899 } 2900 2901 /* 2902 * Duplicate Address Detection 2903 */ 2904 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 2905 { 2906 unsigned long rand_num; 2907 struct inet6_dev *idev = ifp->idev; 2908 2909 if (ifp->flags & IFA_F_OPTIMISTIC) 2910 rand_num = 0; 2911 else 2912 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1); 2913 2914 ifp->probes = idev->cnf.dad_transmits; 2915 addrconf_mod_timer(ifp, AC_DAD, rand_num); 2916 } 2917 2918 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags) 2919 { 2920 struct inet6_dev *idev = ifp->idev; 2921 struct net_device *dev = idev->dev; 2922 2923 addrconf_join_solict(dev, &ifp->addr); 2924 2925 net_srandom(ifp->addr.s6_addr32[3]); 2926 2927 read_lock_bh(&idev->lock); 2928 spin_lock(&ifp->lock); 2929 if (ifp->state == INET6_IFADDR_STATE_DEAD) 2930 goto out; 2931 2932 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 2933 idev->cnf.accept_dad < 1 || 2934 !(ifp->flags&IFA_F_TENTATIVE) || 2935 ifp->flags & IFA_F_NODAD) { 2936 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 2937 spin_unlock(&ifp->lock); 2938 read_unlock_bh(&idev->lock); 2939 2940 addrconf_dad_completed(ifp); 2941 return; 2942 } 2943 2944 if (!(idev->if_flags & IF_READY)) { 2945 spin_unlock(&ifp->lock); 2946 read_unlock_bh(&idev->lock); 2947 /* 2948 * If the device is not ready: 2949 * - keep it tentative if it is a permanent address. 2950 * - otherwise, kill it. 2951 */ 2952 in6_ifa_hold(ifp); 2953 addrconf_dad_stop(ifp, 0); 2954 return; 2955 } 2956 2957 /* 2958 * Optimistic nodes can start receiving 2959 * Frames right away 2960 */ 2961 if (ifp->flags & IFA_F_OPTIMISTIC) 2962 ip6_ins_rt(ifp->rt); 2963 2964 addrconf_dad_kick(ifp); 2965 out: 2966 spin_unlock(&ifp->lock); 2967 read_unlock_bh(&idev->lock); 2968 } 2969 2970 static void addrconf_dad_timer(unsigned long data) 2971 { 2972 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2973 struct inet6_dev *idev = ifp->idev; 2974 struct in6_addr mcaddr; 2975 2976 if (!ifp->probes && addrconf_dad_end(ifp)) 2977 goto out; 2978 2979 read_lock(&idev->lock); 2980 if (idev->dead || !(idev->if_flags & IF_READY)) { 2981 read_unlock(&idev->lock); 2982 goto out; 2983 } 2984 2985 spin_lock(&ifp->lock); 2986 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 2987 spin_unlock(&ifp->lock); 2988 read_unlock(&idev->lock); 2989 goto out; 2990 } 2991 2992 if (ifp->probes == 0) { 2993 /* 2994 * DAD was successful 2995 */ 2996 2997 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 2998 spin_unlock(&ifp->lock); 2999 read_unlock(&idev->lock); 3000 3001 addrconf_dad_completed(ifp); 3002 3003 goto out; 3004 } 3005 3006 ifp->probes--; 3007 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time); 3008 spin_unlock(&ifp->lock); 3009 read_unlock(&idev->lock); 3010 3011 /* send a neighbour solicitation for our addr */ 3012 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 3013 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any); 3014 out: 3015 in6_ifa_put(ifp); 3016 } 3017 3018 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 3019 { 3020 struct net_device *dev = ifp->idev->dev; 3021 3022 /* 3023 * Configure the address for reception. Now it is valid. 3024 */ 3025 3026 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3027 3028 /* If added prefix is link local and we are prepared to process 3029 router advertisements, start sending router solicitations. 3030 */ 3031 3032 if (((ifp->idev->cnf.accept_ra == 1 && !ifp->idev->cnf.forwarding) || 3033 ifp->idev->cnf.accept_ra == 2) && 3034 ifp->idev->cnf.rtr_solicits > 0 && 3035 (dev->flags&IFF_LOOPBACK) == 0 && 3036 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) { 3037 /* 3038 * If a host as already performed a random delay 3039 * [...] as part of DAD [...] there is no need 3040 * to delay again before sending the first RS 3041 */ 3042 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 3043 3044 spin_lock_bh(&ifp->lock); 3045 ifp->probes = 1; 3046 ifp->idev->if_flags |= IF_RS_SENT; 3047 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval); 3048 spin_unlock_bh(&ifp->lock); 3049 } 3050 } 3051 3052 static void addrconf_dad_run(struct inet6_dev *idev) 3053 { 3054 struct inet6_ifaddr *ifp; 3055 3056 read_lock_bh(&idev->lock); 3057 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3058 spin_lock(&ifp->lock); 3059 if (ifp->flags & IFA_F_TENTATIVE && 3060 ifp->state == INET6_IFADDR_STATE_DAD) 3061 addrconf_dad_kick(ifp); 3062 spin_unlock(&ifp->lock); 3063 } 3064 read_unlock_bh(&idev->lock); 3065 } 3066 3067 #ifdef CONFIG_PROC_FS 3068 struct if6_iter_state { 3069 struct seq_net_private p; 3070 int bucket; 3071 int offset; 3072 }; 3073 3074 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 3075 { 3076 struct inet6_ifaddr *ifa = NULL; 3077 struct if6_iter_state *state = seq->private; 3078 struct net *net = seq_file_net(seq); 3079 int p = 0; 3080 3081 /* initial bucket if pos is 0 */ 3082 if (pos == 0) { 3083 state->bucket = 0; 3084 state->offset = 0; 3085 } 3086 3087 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 3088 struct hlist_node *n; 3089 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket], 3090 addr_lst) { 3091 /* sync with offset */ 3092 if (p < state->offset) { 3093 p++; 3094 continue; 3095 } 3096 state->offset++; 3097 if (net_eq(dev_net(ifa->idev->dev), net)) 3098 return ifa; 3099 } 3100 3101 /* prepare for next bucket */ 3102 state->offset = 0; 3103 p = 0; 3104 } 3105 return NULL; 3106 } 3107 3108 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 3109 struct inet6_ifaddr *ifa) 3110 { 3111 struct if6_iter_state *state = seq->private; 3112 struct net *net = seq_file_net(seq); 3113 struct hlist_node *n = &ifa->addr_lst; 3114 3115 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst) { 3116 state->offset++; 3117 if (net_eq(dev_net(ifa->idev->dev), net)) 3118 return ifa; 3119 } 3120 3121 while (++state->bucket < IN6_ADDR_HSIZE) { 3122 state->offset = 0; 3123 hlist_for_each_entry_rcu_bh(ifa, n, 3124 &inet6_addr_lst[state->bucket], addr_lst) { 3125 state->offset++; 3126 if (net_eq(dev_net(ifa->idev->dev), net)) 3127 return ifa; 3128 } 3129 } 3130 3131 return NULL; 3132 } 3133 3134 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 3135 __acquires(rcu_bh) 3136 { 3137 rcu_read_lock_bh(); 3138 return if6_get_first(seq, *pos); 3139 } 3140 3141 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3142 { 3143 struct inet6_ifaddr *ifa; 3144 3145 ifa = if6_get_next(seq, v); 3146 ++*pos; 3147 return ifa; 3148 } 3149 3150 static void if6_seq_stop(struct seq_file *seq, void *v) 3151 __releases(rcu_bh) 3152 { 3153 rcu_read_unlock_bh(); 3154 } 3155 3156 static int if6_seq_show(struct seq_file *seq, void *v) 3157 { 3158 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 3159 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 3160 &ifp->addr, 3161 ifp->idev->dev->ifindex, 3162 ifp->prefix_len, 3163 ifp->scope, 3164 ifp->flags, 3165 ifp->idev->dev->name); 3166 return 0; 3167 } 3168 3169 static const struct seq_operations if6_seq_ops = { 3170 .start = if6_seq_start, 3171 .next = if6_seq_next, 3172 .show = if6_seq_show, 3173 .stop = if6_seq_stop, 3174 }; 3175 3176 static int if6_seq_open(struct inode *inode, struct file *file) 3177 { 3178 return seq_open_net(inode, file, &if6_seq_ops, 3179 sizeof(struct if6_iter_state)); 3180 } 3181 3182 static const struct file_operations if6_fops = { 3183 .owner = THIS_MODULE, 3184 .open = if6_seq_open, 3185 .read = seq_read, 3186 .llseek = seq_lseek, 3187 .release = seq_release_net, 3188 }; 3189 3190 static int __net_init if6_proc_net_init(struct net *net) 3191 { 3192 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops)) 3193 return -ENOMEM; 3194 return 0; 3195 } 3196 3197 static void __net_exit if6_proc_net_exit(struct net *net) 3198 { 3199 proc_net_remove(net, "if_inet6"); 3200 } 3201 3202 static struct pernet_operations if6_proc_net_ops = { 3203 .init = if6_proc_net_init, 3204 .exit = if6_proc_net_exit, 3205 }; 3206 3207 int __init if6_proc_init(void) 3208 { 3209 return register_pernet_subsys(&if6_proc_net_ops); 3210 } 3211 3212 void if6_proc_exit(void) 3213 { 3214 unregister_pernet_subsys(&if6_proc_net_ops); 3215 } 3216 #endif /* CONFIG_PROC_FS */ 3217 3218 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 3219 /* Check if address is a home address configured on any interface. */ 3220 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 3221 { 3222 int ret = 0; 3223 struct inet6_ifaddr *ifp = NULL; 3224 struct hlist_node *n; 3225 unsigned int hash = ipv6_addr_hash(addr); 3226 3227 rcu_read_lock_bh(); 3228 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) { 3229 if (!net_eq(dev_net(ifp->idev->dev), net)) 3230 continue; 3231 if (ipv6_addr_equal(&ifp->addr, addr) && 3232 (ifp->flags & IFA_F_HOMEADDRESS)) { 3233 ret = 1; 3234 break; 3235 } 3236 } 3237 rcu_read_unlock_bh(); 3238 return ret; 3239 } 3240 #endif 3241 3242 /* 3243 * Periodic address status verification 3244 */ 3245 3246 static void addrconf_verify(unsigned long foo) 3247 { 3248 unsigned long now, next, next_sec, next_sched; 3249 struct inet6_ifaddr *ifp; 3250 struct hlist_node *node; 3251 int i; 3252 3253 rcu_read_lock_bh(); 3254 spin_lock(&addrconf_verify_lock); 3255 now = jiffies; 3256 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 3257 3258 del_timer(&addr_chk_timer); 3259 3260 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3261 restart: 3262 hlist_for_each_entry_rcu_bh(ifp, node, 3263 &inet6_addr_lst[i], addr_lst) { 3264 unsigned long age; 3265 3266 if (ifp->flags & IFA_F_PERMANENT) 3267 continue; 3268 3269 spin_lock(&ifp->lock); 3270 /* We try to batch several events at once. */ 3271 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 3272 3273 if (ifp->valid_lft != INFINITY_LIFE_TIME && 3274 age >= ifp->valid_lft) { 3275 spin_unlock(&ifp->lock); 3276 in6_ifa_hold(ifp); 3277 ipv6_del_addr(ifp); 3278 goto restart; 3279 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 3280 spin_unlock(&ifp->lock); 3281 continue; 3282 } else if (age >= ifp->prefered_lft) { 3283 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 3284 int deprecate = 0; 3285 3286 if (!(ifp->flags&IFA_F_DEPRECATED)) { 3287 deprecate = 1; 3288 ifp->flags |= IFA_F_DEPRECATED; 3289 } 3290 3291 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)) 3292 next = ifp->tstamp + ifp->valid_lft * HZ; 3293 3294 spin_unlock(&ifp->lock); 3295 3296 if (deprecate) { 3297 in6_ifa_hold(ifp); 3298 3299 ipv6_ifa_notify(0, ifp); 3300 in6_ifa_put(ifp); 3301 goto restart; 3302 } 3303 #ifdef CONFIG_IPV6_PRIVACY 3304 } else if ((ifp->flags&IFA_F_TEMPORARY) && 3305 !(ifp->flags&IFA_F_TENTATIVE)) { 3306 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 3307 ifp->idev->cnf.dad_transmits * 3308 ifp->idev->nd_parms->retrans_time / HZ; 3309 3310 if (age >= ifp->prefered_lft - regen_advance) { 3311 struct inet6_ifaddr *ifpub = ifp->ifpub; 3312 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3313 next = ifp->tstamp + ifp->prefered_lft * HZ; 3314 if (!ifp->regen_count && ifpub) { 3315 ifp->regen_count++; 3316 in6_ifa_hold(ifp); 3317 in6_ifa_hold(ifpub); 3318 spin_unlock(&ifp->lock); 3319 3320 spin_lock(&ifpub->lock); 3321 ifpub->regen_count = 0; 3322 spin_unlock(&ifpub->lock); 3323 ipv6_create_tempaddr(ifpub, ifp); 3324 in6_ifa_put(ifpub); 3325 in6_ifa_put(ifp); 3326 goto restart; 3327 } 3328 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 3329 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 3330 spin_unlock(&ifp->lock); 3331 #endif 3332 } else { 3333 /* ifp->prefered_lft <= ifp->valid_lft */ 3334 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3335 next = ifp->tstamp + ifp->prefered_lft * HZ; 3336 spin_unlock(&ifp->lock); 3337 } 3338 } 3339 } 3340 3341 next_sec = round_jiffies_up(next); 3342 next_sched = next; 3343 3344 /* If rounded timeout is accurate enough, accept it. */ 3345 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 3346 next_sched = next_sec; 3347 3348 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 3349 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 3350 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 3351 3352 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 3353 now, next, next_sec, next_sched)); 3354 3355 addr_chk_timer.expires = next_sched; 3356 add_timer(&addr_chk_timer); 3357 spin_unlock(&addrconf_verify_lock); 3358 rcu_read_unlock_bh(); 3359 } 3360 3361 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local) 3362 { 3363 struct in6_addr *pfx = NULL; 3364 3365 if (addr) 3366 pfx = nla_data(addr); 3367 3368 if (local) { 3369 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 3370 pfx = NULL; 3371 else 3372 pfx = nla_data(local); 3373 } 3374 3375 return pfx; 3376 } 3377 3378 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 3379 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 3380 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 3381 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 3382 }; 3383 3384 static int 3385 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3386 { 3387 struct net *net = sock_net(skb->sk); 3388 struct ifaddrmsg *ifm; 3389 struct nlattr *tb[IFA_MAX+1]; 3390 struct in6_addr *pfx; 3391 int err; 3392 3393 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3394 if (err < 0) 3395 return err; 3396 3397 ifm = nlmsg_data(nlh); 3398 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3399 if (pfx == NULL) 3400 return -EINVAL; 3401 3402 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen); 3403 } 3404 3405 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags, 3406 u32 prefered_lft, u32 valid_lft) 3407 { 3408 u32 flags; 3409 clock_t expires; 3410 unsigned long timeout; 3411 3412 if (!valid_lft || (prefered_lft > valid_lft)) 3413 return -EINVAL; 3414 3415 timeout = addrconf_timeout_fixup(valid_lft, HZ); 3416 if (addrconf_finite_timeout(timeout)) { 3417 expires = jiffies_to_clock_t(timeout * HZ); 3418 valid_lft = timeout; 3419 flags = RTF_EXPIRES; 3420 } else { 3421 expires = 0; 3422 flags = 0; 3423 ifa_flags |= IFA_F_PERMANENT; 3424 } 3425 3426 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 3427 if (addrconf_finite_timeout(timeout)) { 3428 if (timeout == 0) 3429 ifa_flags |= IFA_F_DEPRECATED; 3430 prefered_lft = timeout; 3431 } 3432 3433 spin_lock_bh(&ifp->lock); 3434 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags; 3435 ifp->tstamp = jiffies; 3436 ifp->valid_lft = valid_lft; 3437 ifp->prefered_lft = prefered_lft; 3438 3439 spin_unlock_bh(&ifp->lock); 3440 if (!(ifp->flags&IFA_F_TENTATIVE)) 3441 ipv6_ifa_notify(0, ifp); 3442 3443 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 3444 expires, flags); 3445 addrconf_verify(0); 3446 3447 return 0; 3448 } 3449 3450 static int 3451 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3452 { 3453 struct net *net = sock_net(skb->sk); 3454 struct ifaddrmsg *ifm; 3455 struct nlattr *tb[IFA_MAX+1]; 3456 struct in6_addr *pfx; 3457 struct inet6_ifaddr *ifa; 3458 struct net_device *dev; 3459 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 3460 u8 ifa_flags; 3461 int err; 3462 3463 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3464 if (err < 0) 3465 return err; 3466 3467 ifm = nlmsg_data(nlh); 3468 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3469 if (pfx == NULL) 3470 return -EINVAL; 3471 3472 if (tb[IFA_CACHEINFO]) { 3473 struct ifa_cacheinfo *ci; 3474 3475 ci = nla_data(tb[IFA_CACHEINFO]); 3476 valid_lft = ci->ifa_valid; 3477 preferred_lft = ci->ifa_prefered; 3478 } else { 3479 preferred_lft = INFINITY_LIFE_TIME; 3480 valid_lft = INFINITY_LIFE_TIME; 3481 } 3482 3483 dev = __dev_get_by_index(net, ifm->ifa_index); 3484 if (dev == NULL) 3485 return -ENODEV; 3486 3487 /* We ignore other flags so far. */ 3488 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS); 3489 3490 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 3491 if (ifa == NULL) { 3492 /* 3493 * It would be best to check for !NLM_F_CREATE here but 3494 * userspace alreay relies on not having to provide this. 3495 */ 3496 return inet6_addr_add(net, ifm->ifa_index, pfx, 3497 ifm->ifa_prefixlen, ifa_flags, 3498 preferred_lft, valid_lft); 3499 } 3500 3501 if (nlh->nlmsg_flags & NLM_F_EXCL || 3502 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 3503 err = -EEXIST; 3504 else 3505 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 3506 3507 in6_ifa_put(ifa); 3508 3509 return err; 3510 } 3511 3512 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags, 3513 u8 scope, int ifindex) 3514 { 3515 struct ifaddrmsg *ifm; 3516 3517 ifm = nlmsg_data(nlh); 3518 ifm->ifa_family = AF_INET6; 3519 ifm->ifa_prefixlen = prefixlen; 3520 ifm->ifa_flags = flags; 3521 ifm->ifa_scope = scope; 3522 ifm->ifa_index = ifindex; 3523 } 3524 3525 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 3526 unsigned long tstamp, u32 preferred, u32 valid) 3527 { 3528 struct ifa_cacheinfo ci; 3529 3530 ci.cstamp = cstamp_delta(cstamp); 3531 ci.tstamp = cstamp_delta(tstamp); 3532 ci.ifa_prefered = preferred; 3533 ci.ifa_valid = valid; 3534 3535 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 3536 } 3537 3538 static inline int rt_scope(int ifa_scope) 3539 { 3540 if (ifa_scope & IFA_HOST) 3541 return RT_SCOPE_HOST; 3542 else if (ifa_scope & IFA_LINK) 3543 return RT_SCOPE_LINK; 3544 else if (ifa_scope & IFA_SITE) 3545 return RT_SCOPE_SITE; 3546 else 3547 return RT_SCOPE_UNIVERSE; 3548 } 3549 3550 static inline int inet6_ifaddr_msgsize(void) 3551 { 3552 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 3553 + nla_total_size(16) /* IFA_ADDRESS */ 3554 + nla_total_size(sizeof(struct ifa_cacheinfo)); 3555 } 3556 3557 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 3558 u32 pid, u32 seq, int event, unsigned int flags) 3559 { 3560 struct nlmsghdr *nlh; 3561 u32 preferred, valid; 3562 3563 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3564 if (nlh == NULL) 3565 return -EMSGSIZE; 3566 3567 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 3568 ifa->idev->dev->ifindex); 3569 3570 if (!(ifa->flags&IFA_F_PERMANENT)) { 3571 preferred = ifa->prefered_lft; 3572 valid = ifa->valid_lft; 3573 if (preferred != INFINITY_LIFE_TIME) { 3574 long tval = (jiffies - ifa->tstamp)/HZ; 3575 if (preferred > tval) 3576 preferred -= tval; 3577 else 3578 preferred = 0; 3579 if (valid != INFINITY_LIFE_TIME) { 3580 if (valid > tval) 3581 valid -= tval; 3582 else 3583 valid = 0; 3584 } 3585 } 3586 } else { 3587 preferred = INFINITY_LIFE_TIME; 3588 valid = INFINITY_LIFE_TIME; 3589 } 3590 3591 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 || 3592 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) { 3593 nlmsg_cancel(skb, nlh); 3594 return -EMSGSIZE; 3595 } 3596 3597 return nlmsg_end(skb, nlh); 3598 } 3599 3600 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 3601 u32 pid, u32 seq, int event, u16 flags) 3602 { 3603 struct nlmsghdr *nlh; 3604 u8 scope = RT_SCOPE_UNIVERSE; 3605 int ifindex = ifmca->idev->dev->ifindex; 3606 3607 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 3608 scope = RT_SCOPE_SITE; 3609 3610 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3611 if (nlh == NULL) 3612 return -EMSGSIZE; 3613 3614 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3615 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 || 3616 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 3617 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3618 nlmsg_cancel(skb, nlh); 3619 return -EMSGSIZE; 3620 } 3621 3622 return nlmsg_end(skb, nlh); 3623 } 3624 3625 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 3626 u32 pid, u32 seq, int event, unsigned int flags) 3627 { 3628 struct nlmsghdr *nlh; 3629 u8 scope = RT_SCOPE_UNIVERSE; 3630 int ifindex = ifaca->aca_idev->dev->ifindex; 3631 3632 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 3633 scope = RT_SCOPE_SITE; 3634 3635 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags); 3636 if (nlh == NULL) 3637 return -EMSGSIZE; 3638 3639 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3640 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 || 3641 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 3642 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3643 nlmsg_cancel(skb, nlh); 3644 return -EMSGSIZE; 3645 } 3646 3647 return nlmsg_end(skb, nlh); 3648 } 3649 3650 enum addr_type_t { 3651 UNICAST_ADDR, 3652 MULTICAST_ADDR, 3653 ANYCAST_ADDR, 3654 }; 3655 3656 /* called with rcu_read_lock() */ 3657 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 3658 struct netlink_callback *cb, enum addr_type_t type, 3659 int s_ip_idx, int *p_ip_idx) 3660 { 3661 struct ifmcaddr6 *ifmca; 3662 struct ifacaddr6 *ifaca; 3663 int err = 1; 3664 int ip_idx = *p_ip_idx; 3665 3666 read_lock_bh(&idev->lock); 3667 switch (type) { 3668 case UNICAST_ADDR: { 3669 struct inet6_ifaddr *ifa; 3670 3671 /* unicast address incl. temp addr */ 3672 list_for_each_entry(ifa, &idev->addr_list, if_list) { 3673 if (++ip_idx < s_ip_idx) 3674 continue; 3675 err = inet6_fill_ifaddr(skb, ifa, 3676 NETLINK_CB(cb->skb).pid, 3677 cb->nlh->nlmsg_seq, 3678 RTM_NEWADDR, 3679 NLM_F_MULTI); 3680 if (err <= 0) 3681 break; 3682 } 3683 break; 3684 } 3685 case MULTICAST_ADDR: 3686 /* multicast address */ 3687 for (ifmca = idev->mc_list; ifmca; 3688 ifmca = ifmca->next, ip_idx++) { 3689 if (ip_idx < s_ip_idx) 3690 continue; 3691 err = inet6_fill_ifmcaddr(skb, ifmca, 3692 NETLINK_CB(cb->skb).pid, 3693 cb->nlh->nlmsg_seq, 3694 RTM_GETMULTICAST, 3695 NLM_F_MULTI); 3696 if (err <= 0) 3697 break; 3698 } 3699 break; 3700 case ANYCAST_ADDR: 3701 /* anycast address */ 3702 for (ifaca = idev->ac_list; ifaca; 3703 ifaca = ifaca->aca_next, ip_idx++) { 3704 if (ip_idx < s_ip_idx) 3705 continue; 3706 err = inet6_fill_ifacaddr(skb, ifaca, 3707 NETLINK_CB(cb->skb).pid, 3708 cb->nlh->nlmsg_seq, 3709 RTM_GETANYCAST, 3710 NLM_F_MULTI); 3711 if (err <= 0) 3712 break; 3713 } 3714 break; 3715 default: 3716 break; 3717 } 3718 read_unlock_bh(&idev->lock); 3719 *p_ip_idx = ip_idx; 3720 return err; 3721 } 3722 3723 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 3724 enum addr_type_t type) 3725 { 3726 struct net *net = sock_net(skb->sk); 3727 int h, s_h; 3728 int idx, ip_idx; 3729 int s_idx, s_ip_idx; 3730 struct net_device *dev; 3731 struct inet6_dev *idev; 3732 struct hlist_head *head; 3733 struct hlist_node *node; 3734 3735 s_h = cb->args[0]; 3736 s_idx = idx = cb->args[1]; 3737 s_ip_idx = ip_idx = cb->args[2]; 3738 3739 rcu_read_lock(); 3740 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 3741 idx = 0; 3742 head = &net->dev_index_head[h]; 3743 hlist_for_each_entry_rcu(dev, node, head, index_hlist) { 3744 if (idx < s_idx) 3745 goto cont; 3746 if (h > s_h || idx > s_idx) 3747 s_ip_idx = 0; 3748 ip_idx = 0; 3749 idev = __in6_dev_get(dev); 3750 if (!idev) 3751 goto cont; 3752 3753 if (in6_dump_addrs(idev, skb, cb, type, 3754 s_ip_idx, &ip_idx) <= 0) 3755 goto done; 3756 cont: 3757 idx++; 3758 } 3759 } 3760 done: 3761 rcu_read_unlock(); 3762 cb->args[0] = h; 3763 cb->args[1] = idx; 3764 cb->args[2] = ip_idx; 3765 3766 return skb->len; 3767 } 3768 3769 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 3770 { 3771 enum addr_type_t type = UNICAST_ADDR; 3772 3773 return inet6_dump_addr(skb, cb, type); 3774 } 3775 3776 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 3777 { 3778 enum addr_type_t type = MULTICAST_ADDR; 3779 3780 return inet6_dump_addr(skb, cb, type); 3781 } 3782 3783 3784 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 3785 { 3786 enum addr_type_t type = ANYCAST_ADDR; 3787 3788 return inet6_dump_addr(skb, cb, type); 3789 } 3790 3791 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh, 3792 void *arg) 3793 { 3794 struct net *net = sock_net(in_skb->sk); 3795 struct ifaddrmsg *ifm; 3796 struct nlattr *tb[IFA_MAX+1]; 3797 struct in6_addr *addr = NULL; 3798 struct net_device *dev = NULL; 3799 struct inet6_ifaddr *ifa; 3800 struct sk_buff *skb; 3801 int err; 3802 3803 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3804 if (err < 0) 3805 goto errout; 3806 3807 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3808 if (addr == NULL) { 3809 err = -EINVAL; 3810 goto errout; 3811 } 3812 3813 ifm = nlmsg_data(nlh); 3814 if (ifm->ifa_index) 3815 dev = __dev_get_by_index(net, ifm->ifa_index); 3816 3817 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 3818 if (!ifa) { 3819 err = -EADDRNOTAVAIL; 3820 goto errout; 3821 } 3822 3823 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 3824 if (!skb) { 3825 err = -ENOBUFS; 3826 goto errout_ifa; 3827 } 3828 3829 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid, 3830 nlh->nlmsg_seq, RTM_NEWADDR, 0); 3831 if (err < 0) { 3832 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3833 WARN_ON(err == -EMSGSIZE); 3834 kfree_skb(skb); 3835 goto errout_ifa; 3836 } 3837 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); 3838 errout_ifa: 3839 in6_ifa_put(ifa); 3840 errout: 3841 return err; 3842 } 3843 3844 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 3845 { 3846 struct sk_buff *skb; 3847 struct net *net = dev_net(ifa->idev->dev); 3848 int err = -ENOBUFS; 3849 3850 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 3851 if (skb == NULL) 3852 goto errout; 3853 3854 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 3855 if (err < 0) { 3856 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3857 WARN_ON(err == -EMSGSIZE); 3858 kfree_skb(skb); 3859 goto errout; 3860 } 3861 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3862 return; 3863 errout: 3864 if (err < 0) 3865 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 3866 } 3867 3868 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 3869 __s32 *array, int bytes) 3870 { 3871 BUG_ON(bytes < (DEVCONF_MAX * 4)); 3872 3873 memset(array, 0, bytes); 3874 array[DEVCONF_FORWARDING] = cnf->forwarding; 3875 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 3876 array[DEVCONF_MTU6] = cnf->mtu6; 3877 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 3878 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 3879 array[DEVCONF_AUTOCONF] = cnf->autoconf; 3880 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 3881 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 3882 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 3883 jiffies_to_msecs(cnf->rtr_solicit_interval); 3884 array[DEVCONF_RTR_SOLICIT_DELAY] = 3885 jiffies_to_msecs(cnf->rtr_solicit_delay); 3886 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 3887 #ifdef CONFIG_IPV6_PRIVACY 3888 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 3889 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 3890 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 3891 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 3892 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 3893 #endif 3894 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 3895 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 3896 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 3897 #ifdef CONFIG_IPV6_ROUTER_PREF 3898 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 3899 array[DEVCONF_RTR_PROBE_INTERVAL] = 3900 jiffies_to_msecs(cnf->rtr_probe_interval); 3901 #ifdef CONFIG_IPV6_ROUTE_INFO 3902 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 3903 #endif 3904 #endif 3905 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 3906 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 3907 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3908 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 3909 #endif 3910 #ifdef CONFIG_IPV6_MROUTE 3911 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 3912 #endif 3913 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 3914 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 3915 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 3916 } 3917 3918 static inline size_t inet6_ifla6_size(void) 3919 { 3920 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 3921 + nla_total_size(sizeof(struct ifla_cacheinfo)) 3922 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 3923 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 3924 + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */ 3925 } 3926 3927 static inline size_t inet6_if_nlmsg_size(void) 3928 { 3929 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 3930 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 3931 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 3932 + nla_total_size(4) /* IFLA_MTU */ 3933 + nla_total_size(4) /* IFLA_LINK */ 3934 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 3935 } 3936 3937 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 3938 int items, int bytes) 3939 { 3940 int i; 3941 int pad = bytes - sizeof(u64) * items; 3942 BUG_ON(pad < 0); 3943 3944 /* Use put_unaligned() because stats may not be aligned for u64. */ 3945 put_unaligned(items, &stats[0]); 3946 for (i = 1; i < items; i++) 3947 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 3948 3949 memset(&stats[items], 0, pad); 3950 } 3951 3952 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib, 3953 int items, int bytes, size_t syncpoff) 3954 { 3955 int i; 3956 int pad = bytes - sizeof(u64) * items; 3957 BUG_ON(pad < 0); 3958 3959 /* Use put_unaligned() because stats may not be aligned for u64. */ 3960 put_unaligned(items, &stats[0]); 3961 for (i = 1; i < items; i++) 3962 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]); 3963 3964 memset(&stats[items], 0, pad); 3965 } 3966 3967 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 3968 int bytes) 3969 { 3970 switch (attrtype) { 3971 case IFLA_INET6_STATS: 3972 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6, 3973 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp)); 3974 break; 3975 case IFLA_INET6_ICMP6STATS: 3976 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes); 3977 break; 3978 } 3979 } 3980 3981 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev) 3982 { 3983 struct nlattr *nla; 3984 struct ifla_cacheinfo ci; 3985 3986 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags); 3987 3988 ci.max_reasm_len = IPV6_MAXPLEN; 3989 ci.tstamp = cstamp_delta(idev->tstamp); 3990 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 3991 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time); 3992 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci); 3993 3994 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 3995 if (nla == NULL) 3996 goto nla_put_failure; 3997 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 3998 3999 /* XXX - MC not implemented */ 4000 4001 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 4002 if (nla == NULL) 4003 goto nla_put_failure; 4004 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 4005 4006 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 4007 if (nla == NULL) 4008 goto nla_put_failure; 4009 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 4010 4011 return 0; 4012 4013 nla_put_failure: 4014 return -EMSGSIZE; 4015 } 4016 4017 static size_t inet6_get_link_af_size(const struct net_device *dev) 4018 { 4019 if (!__in6_dev_get(dev)) 4020 return 0; 4021 4022 return inet6_ifla6_size(); 4023 } 4024 4025 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev) 4026 { 4027 struct inet6_dev *idev = __in6_dev_get(dev); 4028 4029 if (!idev) 4030 return -ENODATA; 4031 4032 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4033 return -EMSGSIZE; 4034 4035 return 0; 4036 } 4037 4038 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 4039 u32 pid, u32 seq, int event, unsigned int flags) 4040 { 4041 struct net_device *dev = idev->dev; 4042 struct ifinfomsg *hdr; 4043 struct nlmsghdr *nlh; 4044 void *protoinfo; 4045 4046 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags); 4047 if (nlh == NULL) 4048 return -EMSGSIZE; 4049 4050 hdr = nlmsg_data(nlh); 4051 hdr->ifi_family = AF_INET6; 4052 hdr->__ifi_pad = 0; 4053 hdr->ifi_type = dev->type; 4054 hdr->ifi_index = dev->ifindex; 4055 hdr->ifi_flags = dev_get_flags(dev); 4056 hdr->ifi_change = 0; 4057 4058 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); 4059 4060 if (dev->addr_len) 4061 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); 4062 4063 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); 4064 if (dev->ifindex != dev->iflink) 4065 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); 4066 4067 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 4068 if (protoinfo == NULL) 4069 goto nla_put_failure; 4070 4071 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4072 goto nla_put_failure; 4073 4074 nla_nest_end(skb, protoinfo); 4075 return nlmsg_end(skb, nlh); 4076 4077 nla_put_failure: 4078 nlmsg_cancel(skb, nlh); 4079 return -EMSGSIZE; 4080 } 4081 4082 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 4083 { 4084 struct net *net = sock_net(skb->sk); 4085 int h, s_h; 4086 int idx = 0, s_idx; 4087 struct net_device *dev; 4088 struct inet6_dev *idev; 4089 struct hlist_head *head; 4090 struct hlist_node *node; 4091 4092 s_h = cb->args[0]; 4093 s_idx = cb->args[1]; 4094 4095 rcu_read_lock(); 4096 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4097 idx = 0; 4098 head = &net->dev_index_head[h]; 4099 hlist_for_each_entry_rcu(dev, node, head, index_hlist) { 4100 if (idx < s_idx) 4101 goto cont; 4102 idev = __in6_dev_get(dev); 4103 if (!idev) 4104 goto cont; 4105 if (inet6_fill_ifinfo(skb, idev, 4106 NETLINK_CB(cb->skb).pid, 4107 cb->nlh->nlmsg_seq, 4108 RTM_NEWLINK, NLM_F_MULTI) <= 0) 4109 goto out; 4110 cont: 4111 idx++; 4112 } 4113 } 4114 out: 4115 rcu_read_unlock(); 4116 cb->args[1] = idx; 4117 cb->args[0] = h; 4118 4119 return skb->len; 4120 } 4121 4122 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 4123 { 4124 struct sk_buff *skb; 4125 struct net *net = dev_net(idev->dev); 4126 int err = -ENOBUFS; 4127 4128 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 4129 if (skb == NULL) 4130 goto errout; 4131 4132 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 4133 if (err < 0) { 4134 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 4135 WARN_ON(err == -EMSGSIZE); 4136 kfree_skb(skb); 4137 goto errout; 4138 } 4139 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 4140 return; 4141 errout: 4142 if (err < 0) 4143 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 4144 } 4145 4146 static inline size_t inet6_prefix_nlmsg_size(void) 4147 { 4148 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 4149 + nla_total_size(sizeof(struct in6_addr)) 4150 + nla_total_size(sizeof(struct prefix_cacheinfo)); 4151 } 4152 4153 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 4154 struct prefix_info *pinfo, u32 pid, u32 seq, 4155 int event, unsigned int flags) 4156 { 4157 struct prefixmsg *pmsg; 4158 struct nlmsghdr *nlh; 4159 struct prefix_cacheinfo ci; 4160 4161 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags); 4162 if (nlh == NULL) 4163 return -EMSGSIZE; 4164 4165 pmsg = nlmsg_data(nlh); 4166 pmsg->prefix_family = AF_INET6; 4167 pmsg->prefix_pad1 = 0; 4168 pmsg->prefix_pad2 = 0; 4169 pmsg->prefix_ifindex = idev->dev->ifindex; 4170 pmsg->prefix_len = pinfo->prefix_len; 4171 pmsg->prefix_type = pinfo->type; 4172 pmsg->prefix_pad3 = 0; 4173 pmsg->prefix_flags = 0; 4174 if (pinfo->onlink) 4175 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 4176 if (pinfo->autoconf) 4177 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 4178 4179 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix); 4180 4181 ci.preferred_time = ntohl(pinfo->prefered); 4182 ci.valid_time = ntohl(pinfo->valid); 4183 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci); 4184 4185 return nlmsg_end(skb, nlh); 4186 4187 nla_put_failure: 4188 nlmsg_cancel(skb, nlh); 4189 return -EMSGSIZE; 4190 } 4191 4192 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 4193 struct prefix_info *pinfo) 4194 { 4195 struct sk_buff *skb; 4196 struct net *net = dev_net(idev->dev); 4197 int err = -ENOBUFS; 4198 4199 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 4200 if (skb == NULL) 4201 goto errout; 4202 4203 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 4204 if (err < 0) { 4205 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 4206 WARN_ON(err == -EMSGSIZE); 4207 kfree_skb(skb); 4208 goto errout; 4209 } 4210 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 4211 return; 4212 errout: 4213 if (err < 0) 4214 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 4215 } 4216 4217 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4218 { 4219 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 4220 4221 switch (event) { 4222 case RTM_NEWADDR: 4223 /* 4224 * If the address was optimistic 4225 * we inserted the route at the start of 4226 * our DAD process, so we don't need 4227 * to do it again 4228 */ 4229 if (!(ifp->rt->rt6i_node)) 4230 ip6_ins_rt(ifp->rt); 4231 if (ifp->idev->cnf.forwarding) 4232 addrconf_join_anycast(ifp); 4233 break; 4234 case RTM_DELADDR: 4235 if (ifp->idev->cnf.forwarding) 4236 addrconf_leave_anycast(ifp); 4237 addrconf_leave_solict(ifp->idev, &ifp->addr); 4238 dst_hold(&ifp->rt->dst); 4239 4240 if (ip6_del_rt(ifp->rt)) 4241 dst_free(&ifp->rt->dst); 4242 break; 4243 } 4244 } 4245 4246 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4247 { 4248 rcu_read_lock_bh(); 4249 if (likely(ifp->idev->dead == 0)) 4250 __ipv6_ifa_notify(event, ifp); 4251 rcu_read_unlock_bh(); 4252 } 4253 4254 #ifdef CONFIG_SYSCTL 4255 4256 static 4257 int addrconf_sysctl_forward(ctl_table *ctl, int write, 4258 void __user *buffer, size_t *lenp, loff_t *ppos) 4259 { 4260 int *valp = ctl->data; 4261 int val = *valp; 4262 loff_t pos = *ppos; 4263 int ret; 4264 4265 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 4266 4267 if (write) 4268 ret = addrconf_fixup_forwarding(ctl, valp, val); 4269 if (ret) 4270 *ppos = pos; 4271 return ret; 4272 } 4273 4274 static void dev_disable_change(struct inet6_dev *idev) 4275 { 4276 if (!idev || !idev->dev) 4277 return; 4278 4279 if (idev->cnf.disable_ipv6) 4280 addrconf_notify(NULL, NETDEV_DOWN, idev->dev); 4281 else 4282 addrconf_notify(NULL, NETDEV_UP, idev->dev); 4283 } 4284 4285 static void addrconf_disable_change(struct net *net, __s32 newf) 4286 { 4287 struct net_device *dev; 4288 struct inet6_dev *idev; 4289 4290 rcu_read_lock(); 4291 for_each_netdev_rcu(net, dev) { 4292 idev = __in6_dev_get(dev); 4293 if (idev) { 4294 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 4295 idev->cnf.disable_ipv6 = newf; 4296 if (changed) 4297 dev_disable_change(idev); 4298 } 4299 } 4300 rcu_read_unlock(); 4301 } 4302 4303 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old) 4304 { 4305 struct net *net; 4306 4307 net = (struct net *)table->extra2; 4308 4309 if (p == &net->ipv6.devconf_dflt->disable_ipv6) 4310 return 0; 4311 4312 if (!rtnl_trylock()) { 4313 /* Restore the original values before restarting */ 4314 *p = old; 4315 return restart_syscall(); 4316 } 4317 4318 if (p == &net->ipv6.devconf_all->disable_ipv6) { 4319 __s32 newf = net->ipv6.devconf_all->disable_ipv6; 4320 net->ipv6.devconf_dflt->disable_ipv6 = newf; 4321 addrconf_disable_change(net, newf); 4322 } else if ((!*p) ^ (!old)) 4323 dev_disable_change((struct inet6_dev *)table->extra1); 4324 4325 rtnl_unlock(); 4326 return 0; 4327 } 4328 4329 static 4330 int addrconf_sysctl_disable(ctl_table *ctl, int write, 4331 void __user *buffer, size_t *lenp, loff_t *ppos) 4332 { 4333 int *valp = ctl->data; 4334 int val = *valp; 4335 loff_t pos = *ppos; 4336 int ret; 4337 4338 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 4339 4340 if (write) 4341 ret = addrconf_disable_ipv6(ctl, valp, val); 4342 if (ret) 4343 *ppos = pos; 4344 return ret; 4345 } 4346 4347 static struct addrconf_sysctl_table 4348 { 4349 struct ctl_table_header *sysctl_header; 4350 ctl_table addrconf_vars[DEVCONF_MAX+1]; 4351 char *dev_name; 4352 } addrconf_sysctl __read_mostly = { 4353 .sysctl_header = NULL, 4354 .addrconf_vars = { 4355 { 4356 .procname = "forwarding", 4357 .data = &ipv6_devconf.forwarding, 4358 .maxlen = sizeof(int), 4359 .mode = 0644, 4360 .proc_handler = addrconf_sysctl_forward, 4361 }, 4362 { 4363 .procname = "hop_limit", 4364 .data = &ipv6_devconf.hop_limit, 4365 .maxlen = sizeof(int), 4366 .mode = 0644, 4367 .proc_handler = proc_dointvec, 4368 }, 4369 { 4370 .procname = "mtu", 4371 .data = &ipv6_devconf.mtu6, 4372 .maxlen = sizeof(int), 4373 .mode = 0644, 4374 .proc_handler = proc_dointvec, 4375 }, 4376 { 4377 .procname = "accept_ra", 4378 .data = &ipv6_devconf.accept_ra, 4379 .maxlen = sizeof(int), 4380 .mode = 0644, 4381 .proc_handler = proc_dointvec, 4382 }, 4383 { 4384 .procname = "accept_redirects", 4385 .data = &ipv6_devconf.accept_redirects, 4386 .maxlen = sizeof(int), 4387 .mode = 0644, 4388 .proc_handler = proc_dointvec, 4389 }, 4390 { 4391 .procname = "autoconf", 4392 .data = &ipv6_devconf.autoconf, 4393 .maxlen = sizeof(int), 4394 .mode = 0644, 4395 .proc_handler = proc_dointvec, 4396 }, 4397 { 4398 .procname = "dad_transmits", 4399 .data = &ipv6_devconf.dad_transmits, 4400 .maxlen = sizeof(int), 4401 .mode = 0644, 4402 .proc_handler = proc_dointvec, 4403 }, 4404 { 4405 .procname = "router_solicitations", 4406 .data = &ipv6_devconf.rtr_solicits, 4407 .maxlen = sizeof(int), 4408 .mode = 0644, 4409 .proc_handler = proc_dointvec, 4410 }, 4411 { 4412 .procname = "router_solicitation_interval", 4413 .data = &ipv6_devconf.rtr_solicit_interval, 4414 .maxlen = sizeof(int), 4415 .mode = 0644, 4416 .proc_handler = proc_dointvec_jiffies, 4417 }, 4418 { 4419 .procname = "router_solicitation_delay", 4420 .data = &ipv6_devconf.rtr_solicit_delay, 4421 .maxlen = sizeof(int), 4422 .mode = 0644, 4423 .proc_handler = proc_dointvec_jiffies, 4424 }, 4425 { 4426 .procname = "force_mld_version", 4427 .data = &ipv6_devconf.force_mld_version, 4428 .maxlen = sizeof(int), 4429 .mode = 0644, 4430 .proc_handler = proc_dointvec, 4431 }, 4432 #ifdef CONFIG_IPV6_PRIVACY 4433 { 4434 .procname = "use_tempaddr", 4435 .data = &ipv6_devconf.use_tempaddr, 4436 .maxlen = sizeof(int), 4437 .mode = 0644, 4438 .proc_handler = proc_dointvec, 4439 }, 4440 { 4441 .procname = "temp_valid_lft", 4442 .data = &ipv6_devconf.temp_valid_lft, 4443 .maxlen = sizeof(int), 4444 .mode = 0644, 4445 .proc_handler = proc_dointvec, 4446 }, 4447 { 4448 .procname = "temp_prefered_lft", 4449 .data = &ipv6_devconf.temp_prefered_lft, 4450 .maxlen = sizeof(int), 4451 .mode = 0644, 4452 .proc_handler = proc_dointvec, 4453 }, 4454 { 4455 .procname = "regen_max_retry", 4456 .data = &ipv6_devconf.regen_max_retry, 4457 .maxlen = sizeof(int), 4458 .mode = 0644, 4459 .proc_handler = proc_dointvec, 4460 }, 4461 { 4462 .procname = "max_desync_factor", 4463 .data = &ipv6_devconf.max_desync_factor, 4464 .maxlen = sizeof(int), 4465 .mode = 0644, 4466 .proc_handler = proc_dointvec, 4467 }, 4468 #endif 4469 { 4470 .procname = "max_addresses", 4471 .data = &ipv6_devconf.max_addresses, 4472 .maxlen = sizeof(int), 4473 .mode = 0644, 4474 .proc_handler = proc_dointvec, 4475 }, 4476 { 4477 .procname = "accept_ra_defrtr", 4478 .data = &ipv6_devconf.accept_ra_defrtr, 4479 .maxlen = sizeof(int), 4480 .mode = 0644, 4481 .proc_handler = proc_dointvec, 4482 }, 4483 { 4484 .procname = "accept_ra_pinfo", 4485 .data = &ipv6_devconf.accept_ra_pinfo, 4486 .maxlen = sizeof(int), 4487 .mode = 0644, 4488 .proc_handler = proc_dointvec, 4489 }, 4490 #ifdef CONFIG_IPV6_ROUTER_PREF 4491 { 4492 .procname = "accept_ra_rtr_pref", 4493 .data = &ipv6_devconf.accept_ra_rtr_pref, 4494 .maxlen = sizeof(int), 4495 .mode = 0644, 4496 .proc_handler = proc_dointvec, 4497 }, 4498 { 4499 .procname = "router_probe_interval", 4500 .data = &ipv6_devconf.rtr_probe_interval, 4501 .maxlen = sizeof(int), 4502 .mode = 0644, 4503 .proc_handler = proc_dointvec_jiffies, 4504 }, 4505 #ifdef CONFIG_IPV6_ROUTE_INFO 4506 { 4507 .procname = "accept_ra_rt_info_max_plen", 4508 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 4509 .maxlen = sizeof(int), 4510 .mode = 0644, 4511 .proc_handler = proc_dointvec, 4512 }, 4513 #endif 4514 #endif 4515 { 4516 .procname = "proxy_ndp", 4517 .data = &ipv6_devconf.proxy_ndp, 4518 .maxlen = sizeof(int), 4519 .mode = 0644, 4520 .proc_handler = proc_dointvec, 4521 }, 4522 { 4523 .procname = "accept_source_route", 4524 .data = &ipv6_devconf.accept_source_route, 4525 .maxlen = sizeof(int), 4526 .mode = 0644, 4527 .proc_handler = proc_dointvec, 4528 }, 4529 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4530 { 4531 .procname = "optimistic_dad", 4532 .data = &ipv6_devconf.optimistic_dad, 4533 .maxlen = sizeof(int), 4534 .mode = 0644, 4535 .proc_handler = proc_dointvec, 4536 4537 }, 4538 #endif 4539 #ifdef CONFIG_IPV6_MROUTE 4540 { 4541 .procname = "mc_forwarding", 4542 .data = &ipv6_devconf.mc_forwarding, 4543 .maxlen = sizeof(int), 4544 .mode = 0444, 4545 .proc_handler = proc_dointvec, 4546 }, 4547 #endif 4548 { 4549 .procname = "disable_ipv6", 4550 .data = &ipv6_devconf.disable_ipv6, 4551 .maxlen = sizeof(int), 4552 .mode = 0644, 4553 .proc_handler = addrconf_sysctl_disable, 4554 }, 4555 { 4556 .procname = "accept_dad", 4557 .data = &ipv6_devconf.accept_dad, 4558 .maxlen = sizeof(int), 4559 .mode = 0644, 4560 .proc_handler = proc_dointvec, 4561 }, 4562 { 4563 .procname = "force_tllao", 4564 .data = &ipv6_devconf.force_tllao, 4565 .maxlen = sizeof(int), 4566 .mode = 0644, 4567 .proc_handler = proc_dointvec 4568 }, 4569 { 4570 /* sentinel */ 4571 } 4572 }, 4573 }; 4574 4575 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 4576 struct inet6_dev *idev, struct ipv6_devconf *p) 4577 { 4578 int i; 4579 struct addrconf_sysctl_table *t; 4580 4581 #define ADDRCONF_CTL_PATH_DEV 3 4582 4583 struct ctl_path addrconf_ctl_path[] = { 4584 { .procname = "net", }, 4585 { .procname = "ipv6", }, 4586 { .procname = "conf", }, 4587 { /* to be set */ }, 4588 { }, 4589 }; 4590 4591 4592 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 4593 if (t == NULL) 4594 goto out; 4595 4596 for (i = 0; t->addrconf_vars[i].data; i++) { 4597 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf; 4598 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 4599 t->addrconf_vars[i].extra2 = net; 4600 } 4601 4602 /* 4603 * Make a copy of dev_name, because '.procname' is regarded as const 4604 * by sysctl and we wouldn't want anyone to change it under our feet 4605 * (see SIOCSIFNAME). 4606 */ 4607 t->dev_name = kstrdup(dev_name, GFP_KERNEL); 4608 if (!t->dev_name) 4609 goto free; 4610 4611 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name; 4612 4613 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path, 4614 t->addrconf_vars); 4615 if (t->sysctl_header == NULL) 4616 goto free_procname; 4617 4618 p->sysctl = t; 4619 return 0; 4620 4621 free_procname: 4622 kfree(t->dev_name); 4623 free: 4624 kfree(t); 4625 out: 4626 return -ENOBUFS; 4627 } 4628 4629 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 4630 { 4631 struct addrconf_sysctl_table *t; 4632 4633 if (p->sysctl == NULL) 4634 return; 4635 4636 t = p->sysctl; 4637 p->sysctl = NULL; 4638 unregister_net_sysctl_table(t->sysctl_header); 4639 kfree(t->dev_name); 4640 kfree(t); 4641 } 4642 4643 static void addrconf_sysctl_register(struct inet6_dev *idev) 4644 { 4645 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6", 4646 &ndisc_ifinfo_sysctl_change); 4647 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 4648 idev, &idev->cnf); 4649 } 4650 4651 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 4652 { 4653 __addrconf_sysctl_unregister(&idev->cnf); 4654 neigh_sysctl_unregister(idev->nd_parms); 4655 } 4656 4657 4658 #endif 4659 4660 static int __net_init addrconf_init_net(struct net *net) 4661 { 4662 int err; 4663 struct ipv6_devconf *all, *dflt; 4664 4665 err = -ENOMEM; 4666 all = &ipv6_devconf; 4667 dflt = &ipv6_devconf_dflt; 4668 4669 if (!net_eq(net, &init_net)) { 4670 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL); 4671 if (all == NULL) 4672 goto err_alloc_all; 4673 4674 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 4675 if (dflt == NULL) 4676 goto err_alloc_dflt; 4677 } else { 4678 /* these will be inherited by all namespaces */ 4679 dflt->autoconf = ipv6_defaults.autoconf; 4680 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 4681 } 4682 4683 net->ipv6.devconf_all = all; 4684 net->ipv6.devconf_dflt = dflt; 4685 4686 #ifdef CONFIG_SYSCTL 4687 err = __addrconf_sysctl_register(net, "all", NULL, all); 4688 if (err < 0) 4689 goto err_reg_all; 4690 4691 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 4692 if (err < 0) 4693 goto err_reg_dflt; 4694 #endif 4695 return 0; 4696 4697 #ifdef CONFIG_SYSCTL 4698 err_reg_dflt: 4699 __addrconf_sysctl_unregister(all); 4700 err_reg_all: 4701 kfree(dflt); 4702 #endif 4703 err_alloc_dflt: 4704 kfree(all); 4705 err_alloc_all: 4706 return err; 4707 } 4708 4709 static void __net_exit addrconf_exit_net(struct net *net) 4710 { 4711 #ifdef CONFIG_SYSCTL 4712 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 4713 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 4714 #endif 4715 if (!net_eq(net, &init_net)) { 4716 kfree(net->ipv6.devconf_dflt); 4717 kfree(net->ipv6.devconf_all); 4718 } 4719 } 4720 4721 static struct pernet_operations addrconf_ops = { 4722 .init = addrconf_init_net, 4723 .exit = addrconf_exit_net, 4724 }; 4725 4726 /* 4727 * Device notifier 4728 */ 4729 4730 int register_inet6addr_notifier(struct notifier_block *nb) 4731 { 4732 return atomic_notifier_chain_register(&inet6addr_chain, nb); 4733 } 4734 EXPORT_SYMBOL(register_inet6addr_notifier); 4735 4736 int unregister_inet6addr_notifier(struct notifier_block *nb) 4737 { 4738 return atomic_notifier_chain_unregister(&inet6addr_chain, nb); 4739 } 4740 EXPORT_SYMBOL(unregister_inet6addr_notifier); 4741 4742 static struct rtnl_af_ops inet6_ops = { 4743 .family = AF_INET6, 4744 .fill_link_af = inet6_fill_link_af, 4745 .get_link_af_size = inet6_get_link_af_size, 4746 }; 4747 4748 /* 4749 * Init / cleanup code 4750 */ 4751 4752 int __init addrconf_init(void) 4753 { 4754 int i, err; 4755 4756 err = ipv6_addr_label_init(); 4757 if (err < 0) { 4758 printk(KERN_CRIT "IPv6 Addrconf:" 4759 " cannot initialize default policy table: %d.\n", err); 4760 goto out; 4761 } 4762 4763 err = register_pernet_subsys(&addrconf_ops); 4764 if (err < 0) 4765 goto out_addrlabel; 4766 4767 /* The addrconf netdev notifier requires that loopback_dev 4768 * has it's ipv6 private information allocated and setup 4769 * before it can bring up and give link-local addresses 4770 * to other devices which are up. 4771 * 4772 * Unfortunately, loopback_dev is not necessarily the first 4773 * entry in the global dev_base list of net devices. In fact, 4774 * it is likely to be the very last entry on that list. 4775 * So this causes the notifier registry below to try and 4776 * give link-local addresses to all devices besides loopback_dev 4777 * first, then loopback_dev, which cases all the non-loopback_dev 4778 * devices to fail to get a link-local address. 4779 * 4780 * So, as a temporary fix, allocate the ipv6 structure for 4781 * loopback_dev first by hand. 4782 * Longer term, all of the dependencies ipv6 has upon the loopback 4783 * device and it being up should be removed. 4784 */ 4785 rtnl_lock(); 4786 if (!ipv6_add_dev(init_net.loopback_dev)) 4787 err = -ENOMEM; 4788 rtnl_unlock(); 4789 if (err) 4790 goto errlo; 4791 4792 for (i = 0; i < IN6_ADDR_HSIZE; i++) 4793 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 4794 4795 register_netdevice_notifier(&ipv6_dev_notf); 4796 4797 addrconf_verify(0); 4798 4799 err = rtnl_af_register(&inet6_ops); 4800 if (err < 0) 4801 goto errout_af; 4802 4803 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo, 4804 NULL); 4805 if (err < 0) 4806 goto errout; 4807 4808 /* Only the first call to __rtnl_register can fail */ 4809 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL); 4810 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL); 4811 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, 4812 inet6_dump_ifaddr, NULL); 4813 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, 4814 inet6_dump_ifmcaddr, NULL); 4815 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, 4816 inet6_dump_ifacaddr, NULL); 4817 4818 ipv6_addr_label_rtnl_register(); 4819 4820 return 0; 4821 errout: 4822 rtnl_af_unregister(&inet6_ops); 4823 errout_af: 4824 unregister_netdevice_notifier(&ipv6_dev_notf); 4825 errlo: 4826 unregister_pernet_subsys(&addrconf_ops); 4827 out_addrlabel: 4828 ipv6_addr_label_cleanup(); 4829 out: 4830 return err; 4831 } 4832 4833 void addrconf_cleanup(void) 4834 { 4835 struct net_device *dev; 4836 int i; 4837 4838 unregister_netdevice_notifier(&ipv6_dev_notf); 4839 unregister_pernet_subsys(&addrconf_ops); 4840 ipv6_addr_label_cleanup(); 4841 4842 rtnl_lock(); 4843 4844 __rtnl_af_unregister(&inet6_ops); 4845 4846 /* clean dev list */ 4847 for_each_netdev(&init_net, dev) { 4848 if (__in6_dev_get(dev) == NULL) 4849 continue; 4850 addrconf_ifdown(dev, 1); 4851 } 4852 addrconf_ifdown(init_net.loopback_dev, 2); 4853 4854 /* 4855 * Check hash table. 4856 */ 4857 spin_lock_bh(&addrconf_hash_lock); 4858 for (i = 0; i < IN6_ADDR_HSIZE; i++) 4859 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 4860 spin_unlock_bh(&addrconf_hash_lock); 4861 4862 del_timer(&addr_chk_timer); 4863 rtnl_unlock(); 4864 } 4865